<?php

/*
 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
 * Copyright (C) 2006-2009 Dan Fuhry
 * pageutils.php - a class that handles raw page manipulations, used mostly by AJAX requests or their old-fashioned form-based counterparts
 *
 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
 */
 
class PageUtils {
	
	/**
 	* Tell if a username is used or not.
 	* @param $name the name to check for
 	* @return string
 	*/
	
	public static function checkusername($name)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		$name = str_replace('_', ' ', $name);
		$q = $db->sql_query('SELECT username FROM ' . table_prefix.'users WHERE username=\'' . $db->escape(rawurldecode($name)) . '\'');
		if ( !$q )
		{
			die($db->get_error());
		}
		if ( $db->numrows() < 1)
		{
			$db->free_result(); return('good');
		}
		else
		{
			$db->free_result(); return('bad');
		}
	}
	
	/**
 	* Get the wiki formatting source for a page
 	* @param $page the full page id (Namespace:Pagename)
 	* @return string
 	* @todo (DONE) Make it require a password (just for security purposes)
 	*/
 	
	public static function getsource($page, $password = false)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		if ( !isPage($page) )
		{
			return '';
		}
		
		list($page_id, $namespace) = RenderMan::strToPageID($page);
		$ns = namespace_factory($page_id, $namespace);
		$cdata = $ns->get_cdata();
		
		if ( strlen($cdata['password']) == 40 )
		{
			if(!$password || ( $password != $cdata['password']))
			{
				return 'invalid_password';
			}
		}
		
		if(!$session->get_permissions('view_source')) // Dependencies handle this for us - this also checks for read privileges
			return 'access_denied';
		$pid = RenderMan::strToPageID($page);
		if($pid[1] == 'Special' || $pid[1] == 'Admin')
		{
			die('This type of page (' . $paths->nslist[$pid[1]] . ') cannot be edited because the page source code is not stored in the database.');
		}
		
		$e = $db->sql_query('SELECT page_text,char_tag FROM ' . table_prefix.'page_text WHERE page_id=\'' . $pid[0] . '\' AND namespace=\'' . $pid[1] . '\'');
		if ( !$e )
		{
			$db->_die('The page text could not be selected.');
		}
		if( $db->numrows() < 1 )
		{
			return ''; //$db->_die('There were no rows in the text table that matched the page text query.');
		}
		
		$r = $db->fetchrow();
		$db->free_result();
		$message = $r['page_text'];
		
		return htmlspecialchars($message);
	}
	
	/**
 	* DEPRECATED. Previously returned the full rendered contents of a page.
 	* @param $page the full page id (Namespace:Pagename)
 	* @param $send_headers true if the theme headers should be sent (still dependent on current page settings), false otherwise
 	* @return string
 	*/
	
	public static function getpage($page, $send_headers = false, $hist_id = false)
	{
		die('PageUtils->getpage is deprecated.');
	}
	
	/**
 	* Writes page data to the database, after verifying permissions and running the XSS filter
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $message the text to save
 	* @return string
 	*/
 	
	public static function savepage($page_id, $namespace, $message, $summary = 'No edit summary given', $minor = false)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		
		$page = new PageProcessor($page_id, $namespace);
		$cdata = $page->ns->get_cdata();
		return $page->update_page($message, $summary, $minor, $cdata['page_format']);
	}
	
	/**
 	* Creates a page, both in memory and in the database.
 	* @param string $page_id
 	* @param string $namespace
 	* @return bool true on success, false on failure
 	*/
	
	public static function createPage($page_id, $namespace, $name = false, $visible = 1)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		if(in_array($namespace, Array('Special', 'Admin')))
		{
			// echo '<b>Notice:</b> PageUtils::createPage: You can\'t create a special page in the database<br />';
			return 'You can\'t create a special page in the database';
		}
		
		if(!isset($paths->nslist[$namespace]))
		{
			// echo '<b>Notice:</b> PageUtils::createPage: Couldn\'t look up the namespace<br />';
			return 'Couldn\'t look up the namespace';
		}
		
		$pname = $paths->nslist[$namespace] . $page_id;
		if(isPage($pname))
		{
			// echo '<b>Notice:</b> PageUtils::createPage: Page already exists<br />';
			return 'Page already exists';
		}
		
		if(!$session->get_permissions('create_page'))
		{
			// echo '<b>Notice:</b> PageUtils::createPage: Not authorized to create pages<br />';
			return 'Not authorized to create pages';
		}
		
		if($session->user_level < USER_LEVEL_ADMIN && $namespace == 'System')
		{
			// echo '<b>Notice:</b> PageUtils::createPage: Not authorized to create system messages<br />';
			return 'Not authorized to create system messages';
		}
		
		if ( substr($page_id, 0, 8) == 'Project:' )
		{
			// echo '<b>Notice:</b> PageUtils::createPage: Prefix "Project:" is reserved<br />';
			return 'The prefix "Project:" is reserved for a parser shortcut; if a page was created using this prefix, it would not be possible to link to it.';
		}
		
		/*
		// Dunno why this was here. Enano can handle more flexible names than this...
		$regex = '#^([A-z0-9 _\-\.\/\!\@\(\)]*)$#is';
		if(!preg_match($regex, $name))
		{
			//echo '<b>Notice:</b> PageUtils::createPage: Name contains invalid characters<br />';
			return 'Name contains invalid characters';
		}
		*/
		
		$page_id = dirtify_page_id($page_id);
		
		if ( !$name )
			$name = str_replace('_', ' ', $page_id);
		
		$page_id = sanitize_page_id( $page_id );
		
		$prot = ( $namespace == 'System' ) ? 1 : 0;
		
		$ips = array(
			'ip' => array(),
			'u' => array()
			);
		
		$page_data = Array(
			'name'=>$name,
			'urlname'=>$page_id,
			'namespace'=>$namespace,
			'special'=>0,'visible'=>1,'comments_on'=>0,'protected'=>$prot,'delvotes'=>0,'delvote_ips'=>serialize($ips),'wiki_mode'=>2,
		);
		
		// die('PageUtils::createpage: Creating page with this data:<pre>' . print_r($page_data, true) . '</pre>');
		
		$paths->add_page($page_data);
		
		$qa = $db->sql_query('INSERT INTO ' . table_prefix.'pages(name,urlname,namespace,visible,protected,delvote_ips) VALUES(\'' . $db->escape($name) . '\', \'' . $db->escape($page_id) . '\', \'' . $namespace . '\', '. ( $visible ? '1' : '0' ) .', ' . $prot . ', \'' . $db->escape(serialize($ips)) . '\');');
		$qb = $db->sql_query('INSERT INTO ' . table_prefix.'page_text(page_id,namespace) VALUES(\'' . $db->escape($page_id) . '\', \'' . $namespace . '\');');
		$qc = $db->sql_query('INSERT INTO ' . table_prefix.'logs(time_id,date_string,log_type,action,author,author_uid,page_id,namespace) VALUES('.time().', \'DEPRECATED\', \'page\', \'create\', \'' . $session->username . '\', ' . $session->user_id . ', \'' . $db->escape($page_id) . '\', \'' . $namespace . '\');');
		
		if($qa && $qb && $qc)
			return 'good';
		else
		{
			return $db->get_error();
		}
	}
	
	/**
 	* Sets the protection level on a page.
 	* @param $page_id string the page ID
 	* @param $namespace string the namespace
 	* @param $level int level of protection - 0 is off, 1 is full, 2 is semi
 	* @param $reason string why the page is being (un)protected
 	* @return string - "good" on success, in all other cases, an error string (on query failure, calls $db->_die() )
 	*/
	public static function protect($page_id, $namespace, $level, $reason)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		
		$page = new PageProcessor($page_id, $namespace);
		return $page->protect_page($level, $reason);
	}
	
	/**
 	* Generates an HTML table with history information in it.
 	* @param string the page ID
 	* @param string the namespace
 	* @param string page password
 	* @return string
 	*/
	
	public static function histlist($page_id, $namespace, $password = false)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		if(!$session->get_permissions('history_view'))
			return 'Access denied';
		
		ob_start();
		
		$pname = $paths->get_pathskey($page_id, $namespace);
		$ns = namespace_factory($page_id, $namespace);
		$cdata = $ns->get_cdata();
		
		if ( !isPage($pname) )
		{
			return 'DNE';
		}
		
		if ( isPage($pname) )
		{
			$password_exists = ( !empty($cdata['password']) && $cdata['password'] !== sha1('') );
			if ( $password_exists && $password !== $cdata['password'] )
			{
				return '<p>' . $lang->get('history_err_wrong_password') . '</p>';
			}
		}
		
		$wiki = ( ( $cdata['wiki_mode'] == 2 && getConfig('wiki_mode') == '1') || $cdata['wiki_mode'] == 1) ? true : false;
		$prot = ( ( $cdata['protected'] == 2 && $session->user_logged_in && $session->reg_time + 60*60*24*4 < time() ) || $cdata['protected'] == 1) ? true : false;
		
		$q = 'SELECT log_id,time_id,date_string,page_id,namespace,author,author_uid,u.username,edit_summary,minor_edit FROM ' . table_prefix . "logs AS l\n"
 			. "  LEFT JOIN " . table_prefix . "users AS u\n"
 			. "    ON ( u.user_id = l.author_uid OR u.user_id IS NULL )\n"
 			. "  WHERE log_type='page' AND action='edit' AND page_id='$page_id' AND namespace='$namespace' AND is_draft != 1 ORDER BY time_id DESC;";
		
		if ( !($q = $db->sql_query($q)) )
			$db->_die('The history data for the page "' . $paths->cpage['name'] . '" could not be selected.');
		
		echo $lang->get('history_page_subtitle') . '
					<h3>' . $lang->get('history_heading_edits') . '</h3>';
		$numrows = $db->numrows();
		if ( $numrows < 1 )
		{
			echo $lang->get('history_no_entries');
		}
		else
		{
			echo '<form action="'.makeUrlNS($namespace, $page_id, 'do=diff').'" onsubmit="ajaxHistDiff(); return false;" method="get">
						<input type="submit" value="' . $lang->get('history_btn_compare') . '" />
						' . ( urlSeparator == '&' ? '<input type="hidden" name="title" value="' . htmlspecialchars($paths->nslist[$namespace] . $page_id) . '" />' : '' ) . '
						' . ( $session->sid_super ? '<input type="hidden" name="auth"  value="' . $session->sid_super . '" />' : '') . '
						<input type="hidden" name="do" value="diff" />
						<br /><span>&nbsp;</span>
						<div class="tblholder">
						<table border="0" width="100%" cellspacing="1" cellpadding="4">
						<tr>
							<th colspan="2">' . $lang->get('history_col_diff') . '</th>
							<th>' . $lang->get('history_col_datetime') . '</th>
							<th>' . $lang->get('history_col_user') . '</th>
							<th>' . $lang->get('history_col_summary') . '</th>
							<th>' . $lang->get('history_col_minor') . '</th>
							<th colspan="3">' . $lang->get('history_col_actions') . '</th>
						</tr>'."\n"."\n";
			$cls = 'row2';
			$ticker = 0;
			
			while ( $r = $db->fetchrow($q) )
			{
				
				$ticker++;
				
				if($cls == 'row2') $cls = 'row1';
				else $cls = 'row2';
				
				echo '<tr>'."\n";
				
				// Diff selection
				if($ticker == 1)
				{
					$s1 = '';
					$s2 = 'checked="checked" ';
				}
				elseif($ticker == 2)
				{
					$s1 = 'checked="checked" ';
					$s2 = '';
				}
				else
				{
					$s1 = '';
					$s2 = '';
				}
				if($ticker > 1)        echo '<td class="' . $cls . '" style="padding: 0;"><input ' . $s1 . 'name="diff1" type="radio" value="' . $r['time_id'] . '" id="diff1_' . $r['time_id'] . '" class="clsDiff1Radio" onclick="selectDiff1Button(this);" /></td>'."\n"; else echo '<td class="' . $cls . '"></td>';
				if($ticker < $numrows) echo '<td class="' . $cls . '" style="padding: 0;"><input ' . $s2 . 'name="diff2" type="radio" value="' . $r['time_id'] . '" id="diff2_' . $r['time_id'] . '" class="clsDiff2Radio" onclick="selectDiff2Button(this);" /></td>'."\n"; else echo '<td class="' . $cls . '"></td>';
				
				// Date and time
				echo '<td class="' . $cls . '" style="white-space: nowrap;">' . enano_date(ED_DATE | ED_TIME, intval($r['time_id'])) . '</td class="' . $cls . '">'."\n";
				
				// User
				$real_username = $r['author_uid'] > 1 && !empty($r['username']) ? $r['username'] : $r['author'];
				$rank_info = $session->get_user_rank($r['author_uid']);
				if ( $session->get_permissions('mod_misc') && is_valid_ip($r['author']) && $r['author_uid'] == 1 )
				{
					$rc = ' style="cursor: pointer;" title="' . $lang->get('history_tip_rdns') . '" onclick="ajaxReverseDNS(this, \'' . $r['author'] . '\');"';
				}
				else
				{
					$rc = '';
				}
				echo '<td class="' . $cls . '"' . $rc . '><a href="'.makeUrlNS('User', sanitize_page_id($real_username)).'" ';
				if ( !isPage($paths->nslist['User'] . sanitize_page_id($real_username)) )
				{
					echo 'class="wikilink-nonexistent"';
				}
				echo 'style="' . $rank_info['rank_style'] . '">' . htmlspecialchars($real_username) . '</a></td class="' . $cls . '">'."\n";
				
				// Edit summary
				if ( $r['edit_summary'] == 'Automatic backup created when logs were purged' )
				{
					$r['edit_summary'] = $lang->get('history_summary_clearlogs');
				}
				echo '<td class="' . $cls . '">' . $r['edit_summary'] . '</td>'."\n";
				
				// Minor edit
				echo '<td class="' . $cls . '" style="text-align: center;">'. (( $r['minor_edit'] ) ? 'M' : '' ) .'</td>'."\n";
				
				// Actions!
				echo '<td class="' . $cls . '" style="text-align: center;"><a rel="nofollow" href="'.makeUrlNS($namespace, $page_id, 'oldid=' . $r['log_id']) . '" onclick="ajaxHistView(\'' . $r['log_id'] . '\'); return false;">' . $lang->get('history_action_view') . '</a></td>'."\n";
				echo '<td class="' . $cls . '" style="text-align: center;"><a rel="nofollow" href="'.makeUrl($paths->nslist['Special'].'Contributions/' . $r['author']) . '">' . $lang->get('history_action_contrib') . '</a></td>'."\n";
				echo '<td class="' . $cls . '" style="text-align: center;"><a rel="nofollow" href="'.makeUrlNS($namespace, $page_id, 'do=edit&amp;revid=' . $r['log_id']) . '" onclick="ajaxEditor(\'' . $r['log_id'] . '\'); return false;">' . $lang->get('history_action_restore') . '</a></td>'."\n";
				
				echo '</tr>'."\n"."\n";
				
			}
			echo '</table>
						</div>
						<br />
						<input type="hidden" name="do" value="diff" />
						<input type="submit" value="' . $lang->get('history_btn_compare') . '" />
						</form>
						<script type="text/javascript">if ( !KILL_SWITCH ) { buildDiffList(); }</script>';
		}
		$db->free_result();
		echo '<h3>' . $lang->get('history_heading_other') . '</h3>';
		
		$sql = 'SELECT log_id,action,time_id,date_string,page_id,namespace,author,author_uid,u.username,edit_summary,minor_edit FROM ' . table_prefix . "logs AS l\n"
 				. "  LEFT JOIN " . table_prefix . "users AS u\n"
 				. "    ON ( u.user_id = l.author_uid OR u.user_id IS NULL )\n"
 				. "  WHERE log_type='page' AND action!='edit' AND page_id='$page_id' AND namespace='$namespace' AND is_draft != 1 ORDER BY time_id DESC;";
		
		if ( !( $q = $db->sql_query($sql)) )
		{
			$db->_die('The history data for the page "' . htmlspecialchars($paths->cpage['name']) . '" could not be selected.');
		}
		if ( $db->numrows() < 1 )
		{
			echo $lang->get('history_no_entries');
		}
		else
		{
			
			echo '<div class="tblholder">
							<table border="0" width="100%" cellspacing="1" cellpadding="4"><tr>
								<th>' . $lang->get('history_col_datetime') . '</th>
								<th>' . $lang->get('history_col_user') . '</th>
								<th>' . $lang->get('history_col_minor') . '</th>
								<th>' . $lang->get('history_col_action_taken') . '</th>
								<th>' . $lang->get('history_col_extra') . '</th>
								<th colspan="2"></th>
							</tr>';
			$cls = 'row2';
			while($r = $db->fetchrow($q)) {
				
				if($cls == 'row2') $cls = 'row1';
				else $cls = 'row2';
				
				echo '<tr>';
				
				// Date and time
				echo '<td class="' . $cls . '">' . enano_date(ED_DATE | ED_TIME, intval($r['time_id'])) . '</td class="' . $cls . '">';
				
				// User
				$real_username = $r['author_uid'] > 1 && !empty($r['username']) ? $r['username'] : $r['author'];
				$rank_info = $session->get_user_rank($r['author_uid']);
				if ( $session->get_permissions('mod_misc') && is_valid_ip($r['author']) && $r['author_uid'] == 1 )
				{
					$rc = ' style="cursor: pointer;" title="' . $lang->get('history_tip_rdns') . '" onclick="ajaxReverseDNS(this, \'' . $r['author'] . '\');"';
				}
				else
				{
					$rc = '';
				}
				echo '<td class="' . $cls . '"' . $rc . '><a href="'.makeUrlNS('User', sanitize_page_id($real_username)).'" ';
				if ( !isPage($paths->nslist['User'] . sanitize_page_id($real_username)) )
				{
					echo 'class="wikilink-nonexistent"';
				}
				echo 'style="' . $rank_info['rank_style'] . '">' . htmlspecialchars($real_username) . '</a></td class="' . $cls . '">'."\n";
				
				
				// Minor edit
				echo '<td class="' . $cls . '" style="text-align: center;">'. (( $r['minor_edit'] ) ? 'M' : '' ) .'</td>';
				
				// Action taken
				echo '<td class="' . $cls . '">';
				// Some of these are sanitized at insert-time. Others follow the newer Enano policy of stripping HTML at runtime.
				if    ($r['action']=='prot')     echo $lang->get('history_log_protect') . '</td><td class="' . $cls . '">'     . $lang->get('history_extra_reason') . ' ' . ( $r['edit_summary'] === '__REVERSION__' ? $lang->get('history_extra_protection_reversion') : htmlspecialchars($r['edit_summary']) );
				elseif($r['action']=='unprot')   echo $lang->get('history_log_unprotect') . '</td><td class="' . $cls . '">'   . $lang->get('history_extra_reason') . ' ' . ( $r['edit_summary'] === '__REVERSION__' ? $lang->get('history_extra_protection_reversion') : htmlspecialchars($r['edit_summary']) );
				elseif($r['action']=='semiprot') echo $lang->get('history_log_semiprotect') . '</td><td class="' . $cls . '">' . $lang->get('history_extra_reason') . ' ' . ( $r['edit_summary'] === '__REVERSION__' ? $lang->get('history_extra_protection_reversion') : htmlspecialchars($r['edit_summary']) );
				elseif($r['action']=='rename')   echo $lang->get('history_log_rename') . '</td><td class="' . $cls . '">' . $lang->get('history_extra_oldtitle') . ' '.htmlspecialchars($r['edit_summary']);
				elseif($r['action']=='create')   echo $lang->get('history_log_create') . '</td><td class="' . $cls . '">';
				elseif($r['action']=='delete')   echo $lang->get('history_log_delete') . '</td><td class="' . $cls . '">' . $lang->get('history_extra_reason') . ' ' . $r['edit_summary'];
				elseif($r['action']=='reupload') echo $lang->get('history_log_uploadnew') . '</td><td class="' . $cls . '">' . $lang->get('history_extra_reason') . ' ' . ( $r['edit_summary'] === '__ROLLBACK__' ? $lang->get('history_extra_upload_reversion') : htmlspecialchars($r['edit_summary']) );
				elseif($r['action']=='votereset')echo $lang->get('history_log_votereset') . '</td><td class="' . $cls . '">' . $lang->get('history_extra_numvotes') . ' ' . $r['edit_summary'];
				echo '</td>';
				
				// Actions!
				echo '<td class="' . $cls . '" style="text-align: center;"><a rel="nofollow" href="'.makeUrl($paths->nslist['Special'].'Contributions/' . $r['author']) . '">' . $lang->get('history_action_contrib') . '</a></td>';
				echo '<td class="' . $cls . '" style="text-align: center;"><a rel="nofollow" href="'.makeUrlNS($namespace, $page_id, 'do=rollback&amp;id=' . $r['log_id']) . '" onclick="ajaxRollback(\'' . $r['log_id'] . '\'); return false;">' . $lang->get('history_action_revert') . '</a></td>';
				
				echo '</tr>';
			}
			echo '</table></div>';
		}
		$db->free_result();
		$ret = ob_get_contents();
		ob_end_clean();
		return $ret;
	}
	
	/**
 	* Rolls back a logged action
 	* @param $id the time ID, a.k.a. the primary key in the logs table
 	* @return string
 	*/
 	
	public static function rollback($id)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		// placeholder
		return 'PageUtils->rollback() is deprecated - use PageProcessor instead.';
	}
	
	/**
 	* Posts a comment.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $name the name of the person posting, defaults to current username/IP
 	* @param $subject the subject line of the comment
 	* @param $text the comment text
 	* @return string javascript code
 	*/
 	
	public static function addcomment($page_id, $namespace, $name, $subject, $text, $captcha_code = false, $captcha_id = false)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		$_ob = '';
		if(!$session->get_permissions('post_comments'))
			return 'Access denied';
		if(getConfig('comments_need_login') == '2' && !$session->user_logged_in) _die('Access denied to post comments: you need to be logged in first.');
		if(getConfig('comments_need_login') == '1' && !$session->user_logged_in)
		{
			if(!$captcha_code || !$captcha_id) _die('BUG: PageUtils::addcomment: no CAPTCHA data passed to method');
			$result = $session->get_captcha($captcha_id);
			if(strtolower($captcha_code) != strtolower($result)) _die('The confirmation code you entered was incorrect.');
		}
		$text = RenderMan::preprocess_text($text);
		$name = $session->user_logged_in ? RenderMan::preprocess_text($session->username) : RenderMan::preprocess_text($name);
		$subj = RenderMan::preprocess_text($subject);
		if(getConfig('approve_comments', '0')=='1') $appr = '0'; else $appr = '1';
		$q = 'INSERT INTO ' . table_prefix.'comments(page_id,namespace,subject,comment_data,name,user_id,approved,time) VALUES(\'' . $page_id . '\',\'' . $namespace . '\',\'' . $subj . '\',\'' . $text . '\',\'' . $name . '\',' . $session->user_id . ',' . $appr . ','.time().')';
		$e = $db->sql_query($q);
		if(!$e) die('alert(unescape(\''.rawurlencode('Error inserting comment data: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'))');
		else $_ob .= '<div class="info-box">Your comment has been posted.</div>';
		return PageUtils::comments($page_id, $namespace, false, Array(), $_ob);
	}
	
	/**
 	* Generates partly-compiled HTML/Javascript code to be eval'ed by the user's browser to display comments
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $action administrative action to perform, default is false
 	* @param $flags additional info for $action, shouldn't be used except when deleting/approving comments, etc.
 	* @param $_ob text to prepend to output, used by PageUtils::addcomment
 	* @return array
 	* @access private
 	*/
 	
	public static function comments_raw($page_id, $namespace, $action = false, $flags = Array(), $_ob = '')
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		$pname = $paths->nslist[$namespace] . $page_id;
		$template->init_vars();
		
		ob_start();
		
		if($action && $session->get_permissions('mod_comments')) // Nip hacking attempts in the bud
		{
			switch($action) {
			case "delete":
				if(isset($flags['id']))
				{
					$q = 'DELETE FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND comment_id='.intval($flags['id']).' LIMIT 1;';
				} else {
					$n = $db->escape($flags['name']);
					$s = $db->escape($flags['subj']);
					$t = $db->escape($flags['text']);
					$q = 'DELETE FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND name=\'' . $n . '\' AND subject=\'' . $s . '\' AND comment_data=\'' . $t . '\' LIMIT 1;';
				}
				$e=$db->sql_query($q);
				if(!$e) die('alert(unesape(\''.rawurlencode('Error during query: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'));');
				break;
			case "approve":
				if(isset($flags['id']))
				{
					$where = 'comment_id='.intval($flags['id']);
				} else {
					$n = $db->escape($flags['name']);
					$s = $db->escape($flags['subj']);
					$t = $db->escape($flags['text']);
					$where = 'name=\'' . $n . '\' AND subject=\'' . $s . '\' AND comment_data=\'' . $t . '\'';
				}
				$q = 'SELECT approved FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND ' . $where . ' LIMIT 1;';
				$e = $db->sql_query($q);
				if(!$e) die('alert(unesape(\''.rawurlencode('Error selecting approval status: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'));');
				$r = $db->fetchrow();
				$db->free_result();
				$a = ( $r['approved'] ) ? '0' : '1';
				$q = 'UPDATE ' . table_prefix.'comments SET approved=' . $a . ' WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND ' . $where . ';';
				$e=$db->sql_query($q);
				if(!$e) die('alert(unesape(\''.rawurlencode('Error during query: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'));');
				if($a=='1') $v = $lang->get('comment_btn_mod_unapprove');
				else $v = $lang->get('comment_btn_mod_approve');
				echo 'document.getElementById("mdgApproveLink'.intval($_GET['id']).'").innerHTML="' . $v . '";';
				break;
			}
		}
		
		if(!defined('ENANO_TEMPLATE_LOADED'))
		{
			$template->load_theme($session->theme, $session->style);
		}
		
		$tpl = $template->makeParser('comment.tpl');
		
		$e = $db->sql_query('SELECT * FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND approved=0;');
		if(!$e) $db->_die('The comment text data could not be selected.');
		$num_unapp = $db->numrows();
		$db->free_result();
		$e = $db->sql_query('SELECT * FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND approved=1;');
		if(!$e) $db->_die('The comment text data could not be selected.');
		$num_app = $db->numrows();
		$db->free_result();
		$lq = $db->sql_query('SELECT c.comment_id,c.subject,c.name,c.comment_data,c.approved,c.time,c.user_id,c.ip_address,u.user_level,u.email,u.signature,u.user_has_avatar,u.avatar_type
									FROM ' . table_prefix.'comments AS c
									LEFT JOIN ' . table_prefix.'users AS u
										ON c.user_id=u.user_id
									WHERE page_id=\'' . $page_id . '\'
									AND namespace=\'' . $namespace . '\' ORDER BY c.time ASC;');
		if(!$lq) _die('The comment text data could not be selected. '.$db->get_error());
		$_ob .= '<h3>' . $lang->get('comment_heading') . '</h3>';
		
		$n = ( $session->get_permissions('mod_comments')) ? $db->numrows() : $num_app;
		
		$subst = array(
				'num_comments' => $n,
				'page_type' => $template->namespace_string
			);
		
		$_ob .= '<p>';
		$_ob .= ( $n == 0 ) ? $lang->get('comment_msg_count_zero', $subst) : ( $n == 1 ? $lang->get('comment_msg_count_one', $subst) : $lang->get('comment_msg_count_plural', $subst) );
		
		if ( $session->get_permissions('mod_comments') && $num_unapp > 0 )
		{
			$_ob .= ' <span style="color: #D84308">' . $lang->get('comment_msg_count_unapp_mod', array( 'num_unapp' => $num_unapp )) . '</span>';
		}
		else if ( !$session->get_permissions('mod_comments') && $num_unapp > 0 )
		{
			$ls = ( $num_unapp == 1 ) ? 'comment_msg_count_unapp_one' : 'comment_msg_count_unapp_plural';
			$_ob .= ' <span>' . $lang->get($ls, array( 'num_unapp' => $num_unapp )) . '</span>';
		}
		$_ob .= '</p>';
		$list = 'list = { ';
		// _die(htmlspecialchars($ttext));
		$i = -1;
		while ( $row = $db->fetchrow($lq) )
		{
			$i++;
			$strings = Array();
			$bool = Array();
			if ( $session->get_permissions('mod_comments') || $row['approved'] == COMMENT_APPROVED )
			{
				$list .= $i . ' : { \'comment\' : unescape(\''.rawurlencode($row['comment_data']).'\'), \'name\' : unescape(\''.rawurlencode($row['name']).'\'), \'subject\' : unescape(\''.rawurlencode($row['subject']).'\'), }, ';
				
				// Comment ID (used in the Javascript apps)
				$strings['ID'] = (string)$i;
				
				// Determine the name, and whether to link to the user page or not
				$name = '';
				if($row['user_id'] > 1) $name .= '<a href="'.makeUrlNS('User', sanitize_page_id(' ', '_', $row['name'])).'">';
				$name .= $row['name'];
				if($row['user_id'] > 1) $name .= '</a>';
				$strings['NAME'] = $name; unset($name);
				
				// Subject
				$s = $row['subject'];
				if(!$row['approved']) $s .= ' <span style="color: #D84308">' . $lang->get('comment_msg_note_unapp') . '</span>';
				$strings['SUBJECT'] = $s;
				
				// Date and time
				$strings['DATETIME'] = enano_date(ED_DATE | ED_TIME, $row['time']);
				
				// User level
				switch($row['user_level'])
				{
					default:
					case USER_LEVEL_GUEST:
						$l = $lang->get('user_type_guest');
						break;
					case USER_LEVEL_MEMBER:
					case USER_LEVEL_CHPREF:
						$l = $lang->get('user_type_member');
						break;
					case USER_LEVEL_MOD:
						$l = $lang->get('user_type_mod');
						break;
					case USER_LEVEL_ADMIN:
						$l = $lang->get('user_type_admin');
						break;
				}
				$strings['USER_LEVEL'] = $l; unset($l);
				
				// The actual comment data
				$strings['DATA'] = RenderMan::render($row['comment_data']);
				
				if($session->get_permissions('edit_comments'))
				{
					// Edit link
					$strings['EDIT_LINK'] = '<a href="'.makeUrlNS($namespace, $page_id, 'do=comments&amp;sub=editcomment&amp;id=' . $row['comment_id']) . '" id="editbtn_' . $i . '">' . $lang->get('comment_btn_edit') . '</a>';
				
					// Delete link
					$strings['DELETE_LINK'] = '<a href="'.makeUrlNS($namespace, $page_id, 'do=comments&amp;sub=deletecomment&amp;id=' . $row['comment_id']) . '">' . $lang->get('comment_btn_delete') . '</a>';
				}
				else
				{
					// Edit link
					$strings['EDIT_LINK'] = '';
				
					// Delete link
					$strings['DELETE_LINK'] = '';
				}
				
				// Send PM link
				$strings['SEND_PM_LINK'] = ( $session->user_logged_in && $row['user_id'] > 1 ) ? '<a href="'.makeUrlNS('Special', 'PrivateMessages/Compose/To/' . $row['name']) . '">' . $lang->get('comment_btn_send_privmsg') . '</a><br />' : '';
				
				// Add Buddy link
				$strings['ADD_BUDDY_LINK'] = ( $session->user_logged_in && $row['user_id'] > 1 ) ? '<a href="'.makeUrlNS('Special', 'PrivateMessages/FriendList/Add/' . $row['name']) . '">' . $lang->get('comment_btn_add_buddy') . '</a>' : '';
				
				// Mod links
				$applink = '';
				$applink .= '<a href="'.makeUrlNS($namespace, $page_id, 'do=comments&amp;sub=admin&amp;action=approve&amp;id=' . $row['comment_id']) . '" id="mdgApproveLink' . $i . '">';
				if($row['approved']) $applink .= $lang->get('comment_btn_mod_unapprove');
				else $applink .= $lang->get('comment_btn_mod_approve');
				$applink .= '</a>';
				$strings['MOD_APPROVE_LINK'] = $applink; unset($applink);
				$strings['MOD_DELETE_LINK'] = '<a href="'.makeUrlNS($namespace, $page_id, 'do=comments&amp;sub=admin&amp;action=delete&amp;id=' . $row['comment_id']) . '">' . $lang->get('comment_btn_mod_delete') . '</a>';
				$strings['MOD_IP_LINK'] = '<span style="opacity: 0.5; filter: alpha(opacity=50);">' . ( ( empty($row['ip_address']) ) ? $lang->get('comment_btn_mod_ip_missing') : $lang->get('comment_btn_mod_ip_notimplemented') ) . '</span>';
				
				// Signature
				$strings['SIGNATURE'] = '';
				if($row['signature'] != '') $strings['SIGNATURE'] = RenderMan::render($row['signature']);
				
				// Avatar
				if ( $row['user_has_avatar'] == 1 )
				{
					$bool['user_has_avatar'] = true;
					$strings['AVATAR_ALT'] = $lang->get('usercp_avatar_image_alt', array('username' => $row['name']));
					$strings['AVATAR_URL'] = make_avatar_url(intval($row['user_id']), $row['avatar_type'], $row['email']);
					$strings['USERPAGE_LINK'] = makeUrlNS('User', $row['name']);
				}
				
				$bool['auth_mod'] = ($session->get_permissions('mod_comments')) ? true : false;
				$bool['can_edit'] = ( ( $session->user_logged_in && $row['name'] == $session->username && $session->get_permissions('edit_comments') ) || $session->get_permissions('mod_comments') ) ? true : false;
				$bool['signature'] = ( $strings['SIGNATURE'] == '' ) ? false : true;
				
				// Done processing and compiling, now let's cook it into HTML
				$tpl->assign_vars($strings);
				$tpl->assign_bool($bool);
				$_ob .= $tpl->run();
			}
		}
		if(getConfig('comments_need_login') != '2' || $session->user_logged_in)
		{
			if($session->get_permissions('post_comments'))
			{
				$_ob .= '<h3>' . $lang->get('comment_postform_title') . '</h3>';
				$_ob .= $lang->get('comment_postform_blurb');
				if(getConfig('approve_comments', '0')=='1') $_ob .= ' ' . $lang->get('comment_postform_blurb_unapp');
				if(getConfig('comments_need_login') == '1' && !$session->user_logged_in)
				{
					$_ob .= ' ' . $lang->get('comment_postform_blurb_captcha');
				}
				$sn = $session->user_logged_in ? $session->username . '<input name="name" id="mdgScreenName" type="hidden" value="' . $session->username . '" />' : '<input name="name" id="mdgScreenName" type="text" size="35" />';
				$_ob .= '  <a href="#" id="mdgCommentFormLink" style="display: none;" onclick="document.getElementById(\'mdgCommentForm\').style.display=\'block\';this.style.display=\'none\';return false;">' . $lang->get('comment_postform_blurb_link') . '</a>
				<div id="mdgCommentForm">
				<form action="'.makeUrlNS($namespace, $page_id, 'do=comments&amp;sub=postcomment').'" method="post" style="margin-left: 1em">
				<table border="0">
				<tr><td>' . $lang->get('comment_postform_field_name') . '</td><td>' . $sn . '</td></tr>
				<tr><td>' . $lang->get('comment_postform_field_subject') . '</td><td><input name="subj" id="mdgSubject" type="text" size="35" /></td></tr>';
				if(getConfig('comments_need_login') == '1' && !$session->user_logged_in)
				{
					$session->kill_captcha();
					$captcha = $session->make_captcha();
					$_ob .= '<tr><td>' . $lang->get('comment_postform_field_captcha_title') . '<br /><small>' . $lang->get('comment_postform_field_captcha_blurb') . '</small></td><td><img src="'.makeUrlNS('Special', 'Captcha/' . $captcha) . '" alt="Visual confirmation" style="cursor: pointer;" onclick="this.src = \''.makeUrlNS("Special", "Captcha/".$captcha).'/\'+Math.floor(Math.random() * 100000);" /><input name="captcha_id" id="mdgCaptchaID" type="hidden" value="' . $captcha . '" /><br />' . $lang->get('comment_postform_field_captcha_label') . ' <input name="captcha_input" id="mdgCaptchaInput" type="text" size="10" /><br /><small><script type="text/javascript">document.write("' . $lang->get('comment_postform_field_captcha_cantread_js') . '");</script><noscript>' . $lang->get('comment_postform_field_captcha_cantread_nojs') . '</noscript></small></td></tr>';
				}
				$_ob .= '
				<tr><td valign="top">' . $lang->get('comment_postform_field_comment') . '</td><td><textarea name="text" id="mdgCommentArea" rows="10" cols="40"></textarea></td></tr>
				<tr><td colspan="2" style="text-align: center;"><input type="submit" value="' . $lang->get('comment_postform_btn_submit') . '" /></td></tr>
				</table>
				</form>
				</div>';
			}
		} else {
			// FIXME: l10n
			$_ob .= '<h3>' . $lang->get('comment_postform_title') . '</h3><p>You need to be logged in to post comments. <a href="'.makeUrlNS('Special', 'Login/' . $pname . '%2523comments').'">Log in</a></p>';
		}
		$list .= '};';
		echo 'document.getElementById(\'ajaxEditContainer\').innerHTML = unescape(\''. rawurlencode($_ob) .'\');
		' . $list;
		echo 'Fat.fade_all(); document.getElementById(\'mdgCommentForm\').style.display = \'none\'; document.getElementById(\'mdgCommentFormLink\').style.display="inline";';
		
		$ret = ob_get_contents();
		ob_end_clean();
		return Array($ret, $_ob);
		
	}
	
	/**
 	* Generates ready-to-execute Javascript code to be eval'ed by the user's browser to display comments
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $action administrative action to perform, default is false
 	* @param $flags additional info for $action, shouldn't be used except when deleting/approving comments, etc.
 	* @param $_ob text to prepend to output, used by PageUtils::addcomment
 	* @return string
 	*/
 	
	public static function comments($page_id, $namespace, $action = false, $id = -1, $_ob = '')
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		$r = PageUtils::comments_raw($page_id, $namespace, $action, $id, $_ob);
		return $r[0];
	}
	
	/**
 	* Generates HTML code for comments - used in browser compatibility mode
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $action administrative action to perform, default is false
 	* @param $flags additional info for $action, shouldn't be used except when deleting/approving comments, etc.
 	* @param $_ob text to prepend to output, used by PageUtils::addcomment
 	* @return string
 	*/
	
	public static function comments_html($page_id, $namespace, $action = false, $id = -1, $_ob = '')
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		$r = PageUtils::comments_raw($page_id, $namespace, $action, $id, $_ob);
		return $r[1];
	}
	
	/**
 	* Updates comment data.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $subject new subject
 	* @param $text new text
 	* @param $old_subject the old subject, unprocessed and identical to the value in the DB
 	* @param $old_text the old text, unprocessed and identical to the value in the DB
 	* @param $id the javascript list ID, used internally by the client-side app
 	* @return string
 	*/
	
	public static function savecomment($page_id, $namespace, $subject, $text, $old_subject, $old_text, $id = -1)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		if(!$session->get_permissions('edit_comments'))
			return 'result="BAD";error="Access denied"';
		// Avoid SQL injection
		$old_text    = $db->escape($old_text);
		$old_subject = $db->escape($old_subject);
		// Safety check - username/login
		if(!$session->get_permissions('mod_comments')) // allow mods to edit comments
		{
			if(!$session->user_logged_in) _die('AJAX comment save safety check failed because you are not logged in. Sometimes this can happen because you are using a browser that does not send cookies as part of AJAX requests.<br /><br />Please log in and try again.');
			$q = 'SELECT c.name FROM ' . table_prefix.'comments c, ' . table_prefix.'users u WHERE comment_data=\'' . $old_text . '\' AND subject=\'' . $old_subject . '\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND u.user_id=c.user_id;';
			$s = $db->sql_query($q);
			if(!$s) _die('SQL error during safety check: '.$db->get_error().'<br /><br />Attempted SQL:<br /><pre>'.htmlspecialchars($q).'</pre>');
			$r = $db->fetchrow($s);
			$db->free_result();
			if($db->numrows() < 1 || $r['name'] != $session->username) _die('Safety check failed, probably due to a hacking attempt.');
		}
		$s = RenderMan::preprocess_text($subject);
		$t = RenderMan::preprocess_text($text);
		$sql  = 'UPDATE ' . table_prefix.'comments SET subject=\'' . $s . '\',comment_data=\'' . $t . '\' WHERE comment_data=\'' . $old_text . '\' AND subject=\'' . $old_subject . '\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'';
		$result = $db->sql_query($sql);
		if($result)
		{
			return 'result="GOOD";
											list[' . $id . '][\'subject\'] = unescape(\''.str_replace('%5Cn', '%0A', rawurlencode(str_replace('{{EnAnO:Newline}}', '\\n', stripslashes(str_replace('\\n', '{{EnAnO:Newline}}', $s))))).'\');
											list[' . $id . '][\'comment\'] = unescape(\''.str_replace('%5Cn', '%0A', rawurlencode(str_replace('{{EnAnO:Newline}}', '\\n', stripslashes(str_replace('\\n', '{{EnAnO:Newline}}', $t))))).'\'); id = ' . $id . ';
			s = unescape(\''.rawurlencode($s).'\');
			t = unescape(\''.str_replace('%5Cn', '<br \\/>', rawurlencode(RenderMan::render(str_replace('{{EnAnO:Newline}}', "\n", stripslashes(str_replace('\\n', '{{EnAnO:Newline}}', $t)))))).'\');';
		}
		else
		{
			return 'result="BAD"; error=unescape("'.rawurlencode('Enano encountered a problem whilst saving the comment.
			Performed SQL:
			' . $sql . '
		
			Error returned by MySQL: '.$db->get_error()).'");';
		}
	}
	
	/**
 	* Updates comment data using the comment_id column instead of the old, messy way
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $subject new subject
 	* @param $text new text
 	* @param $id the comment ID (primary key in enano_comments table)
 	* @return string
 	*/
	
	public static function savecomment_neater($page_id, $namespace, $subject, $text, $id)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		if(!is_int($id)) die('PageUtils::savecomment: $id is not an integer, aborting for safety');
		if(!$session->get_permissions('edit_comments'))
			return 'Access denied';
		// Safety check - username/login
		if(!$session->get_permissions('mod_comments')) // allow mods to edit comments
		{
			if(!$session->user_logged_in) _die('AJAX comment save safety check failed because you are not logged in. Sometimes this can happen because you are using a browser that does not send cookies as part of AJAX requests.<br /><br />Please log in and try again.');
			$q = 'SELECT c.name FROM ' . table_prefix.'comments c, ' . table_prefix.'users u WHERE comment_id=' . $id . ' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND u.user_id=c.user_id;';
			$s = $db->sql_query($q);
			if(!$s) _die('SQL error during safety check: '.$db->get_error().'<br /><br />Attempted SQL:<br /><pre>'.htmlspecialchars($q).'</pre>');
			$r = $db->fetchrow($s);
			if($db->numrows() < 1 || $r['name'] != $session->username) _die('Safety check failed, probably due to a hacking attempt.');
			$db->free_result();
		}
		$s = RenderMan::preprocess_text($subject);
		$t = RenderMan::preprocess_text($text);
		$sql  = 'UPDATE ' . table_prefix.'comments SET subject=\'' . $s . '\',comment_data=\'' . $t . '\' WHERE comment_id=' . $id . ' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'';
		$result = $db->sql_query($sql);
		if($result)
		return 'good';
		else return 'Enano encountered a problem whilst saving the comment.
		Performed SQL:
		' . $sql . '
		
		Error returned by MySQL: '.$db->get_error();
	}
	
	/**
 	* Deletes a comment.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $name the name the user posted under
 	* @param $subj the subject of the comment to be deleted
 	* @param $text the text of the comment to be deleted
 	* @param $id the javascript list ID, used internally by the client-side app
 	* @return string
 	*/
	
	public static function deletecomment($page_id, $namespace, $name, $subj, $text, $id)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		
		if(!$session->get_permissions('edit_comments'))
			return 'alert("Access to delete/edit comments is denied");';
		
		if(!preg_match('#^([0-9]+)$#', (string)$id)) die('$_GET[id] is improperly formed.');
		$n = $db->escape($name);
		$s = $db->escape($subj);
		$t = $db->escape($text);
		
		// Safety check - username/login
		if(!$session->get_permissions('mod_comments')) // allows mods to delete comments
		{
			if(!$session->user_logged_in) _die('AJAX comment save safety check failed because you are not logged in. Sometimes this can happen because you are using a browser that does not send cookies as part of AJAX requests.<br /><br />Please log in and try again.');
			$q = 'SELECT c.name FROM ' . table_prefix.'comments c, ' . table_prefix.'users u WHERE comment_data=\'' . $t . '\' AND subject=\'' . $s . '\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND u.user_id=c.user_id;';
			$s = $db->sql_query($q);
			if(!$s) _die('SQL error during safety check: '.$db->get_error().'<br /><br />Attempted SQL:<br /><pre>'.htmlspecialchars($q).'</pre>');
			$r = $db->fetchrow($s);
			if($db->numrows() < 1 || $r['name'] != $session->username) _die('Safety check failed, probably due to a hacking attempt.');
			$db->free_result();
		}
		$q = 'DELETE FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND name=\'' . $n . '\' AND subject=\'' . $s . '\' AND comment_data=\'' . $t . '\' LIMIT 1;';
		$e=$db->sql_query($q);
		if(!$e) return('alert(unesape(\''.rawurlencode('Error during query: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'));');
		return('good');
	}
	
	/**
 	* Deletes a comment in a cleaner fashion.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $id the comment ID (primary key)
 	* @return string
 	*/
	
	public static function deletecomment_neater($page_id, $namespace, $id)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		
		if(!preg_match('#^([0-9]+)$#', (string)$id)) die('$_GET[id] is improperly formed.');
		
		if(!$session->get_permissions('edit_comments'))
			return 'alert("Access to delete/edit comments is denied");';
		
		// Safety check - username/login
		if(!$session->get_permissions('mod_comments')) // allows mods to delete comments
		{
			if(!$session->user_logged_in) _die('AJAX comment save safety check failed because you are not logged in. Sometimes this can happen because you are using a browser that does not send cookies as part of AJAX requests.<br /><br />Please log in and try again.');
			$q = 'SELECT c.name FROM ' . table_prefix.'comments c, ' . table_prefix.'users u WHERE comment_id=' . $id . ' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND u.user_id=c.user_id;';
			$s = $db->sql_query($q);
			if(!$s) _die('SQL error during safety check: '.$db->get_error().'<br /><br />Attempted SQL:<br /><pre>'.htmlspecialchars($q).'</pre>');
			$r = $db->fetchrow($s);
			if($db->numrows() < 1 || $r['name'] != $session->username) _die('Safety check failed, probably due to a hacking attempt.');
			$db->free_result();
		}
		$q = 'DELETE FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\' AND comment_id=' . $id . ' LIMIT 1;';
		$e=$db->sql_query($q);
		if(!$e) return('alert(unesape(\''.rawurlencode('Error during query: '.$db->get_error().'\n\nQuery:\n' . $q) . '\'));');
		return('good');
	}
	
	/**
 	* Renames a page.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $name the new name for the page
 	* @return string error string or success message
 	*/
 	
	public static function rename($page_id, $namespace, $name)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		$page = new PageProcessor($page_id, $namespace);
		return $page->rename_page($name);
	}
	
	/**
 	* Flushes (clears) the action logs for a given page
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @return string error/success string
 	*/
 	
	public static function flushlogs($page_id, $namespace)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		if ( !is_object($lang) && defined('IN_ENANO_INSTALL') )
		{
			// This is a special exception for the Enano installer, which doesn't init languages yet.
			$lang = new Language('eng');
		}
		if(!$session->get_permissions('clear_logs') && !defined('IN_ENANO_INSTALL'))
		{
			return $lang->get('etc_access_denied');
		}
		if ( !$session->sid_super )
		{
			return $lang->get('etc_access_denied_need_reauth');
		}
		
		$page_id_db = $db->escape($page_id);
		$namespace_db = $db->escape($namespace);
		
		// If we're flushing a file, also clear all revisions before the current
		if ( $namespace == 'File' )
		{
			$q = $db->sql_query('SELECT file_id FROM ' . table_prefix . "files WHERE page_id='$page_id_db' ORDER BY time_id DESC;");
			if ( !$q )
				$db->_die();
			// discard first row (current revision)
			$db->fetchrow();
			$id_list = array();
			while ( $row = $db->fetchrow() )
				$id_list[] = $row['file_id'];
			
			require_once(ENANO_ROOT . '/includes/namespaces/file.php');
			
			// clear out each file
			foreach ( $id_list as $id )
				Namespace_File::delete_file($id);
		}
		
		$q = $db->sql_query('DELETE FROM ' . table_prefix . "logs WHERE page_id='$page_id_db' AND namespace='$namespace';");
		if ( !$q )
			$db->_die('The log entries could not be deleted.');
		
		// If the page exists, make a backup of it in case it gets spammed/vandalized
		// If not, the admin's probably deleting a trash page
		if ( isPage($paths->get_pathskey($page_id, $namespace)) )
		{
			$q = $db->sql_query('SELECT page_text,char_tag FROM ' . table_prefix . "page_text WHERE page_id='$page_id_db' AND namespace='$namespace_db';");
			if ( !$q )
				$db->_die('The current page text could not be selected; as a result, creating the backup of the page failed. Please make a backup copy of the page by clicking Edit this page and then clicking Save Changes.');
			$row = $db->fetchrow();
			$db->free_result();
			$minor_edit = ( ENANO_DBLAYER == 'MYSQL' ) ? 'false' : '0';
			$username = $db->escape($session->username);
			$q = 'INSERT INTO ' . table_prefix . "logs ( log_type, action, time_id, date_string, page_id, namespace, page_text, char_tag, author, author_uid, edit_summary, minor_edit ) VALUES\n"
 				. "  ('page', 'edit', " . time() . ", 'DEPRECATED', '$page_id', '$namespace', '" . $db->escape($row['page_text']) . "', '', '{$username}', $session->user_id, '" . $lang->get('page_flushlogs_backup_summary') . "', $minor_edit);";
			if ( !$db->sql_query($q) )
				$db->_die('The history (log) entry could not be inserted into the logs table.');
		}
		
		return $lang->get('ajax_clearlogs_success');
	}
	
	/**
 	* Deletes a page.
 	* @param string $page_id the condemned page ID
 	* @param string $namespace the condemned namespace
 	* @param string The reason for deleting the page in question
 	* @return string
 	*/
 	
	public static function deletepage($page_id, $namespace, $reason)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		global $cache;
		$perms = $session->fetch_page_acl($page_id, $namespace);
		$x = trim($reason);
		if ( empty($x) )
		{
			return $lang->get('ajax_delete_need_reason');
		}
		if(!$perms->get_permissions('delete_page')) return('Administrative privileges are required to delete pages, you loser.');
		
		if ( !$session->sid_super )
		{
			return $lang->get('etc_access_denied_need_reauth');
		}
		
		$e = $db->sql_query('INSERT INTO ' . table_prefix.'logs(time_id,date_string,log_type,action,page_id,namespace,author,author_uid,edit_summary) VALUES('.time().', \''.enano_date(ED_DATE | ED_TIME).'\', \'page\', \'delete\', \'' . $page_id . '\', \'' . $namespace . '\', \'' . $session->username . '\', ' . $session->user_id . ', \'' . $db->escape(htmlspecialchars($reason)) . '\')');
		if(!$e) $db->_die('The page log entry could not be inserted.');
		$e = $db->sql_query('DELETE FROM ' . table_prefix.'categories WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'');
		if(!$e) $db->_die('The page categorization entries could not be deleted.');
		$e = $db->sql_query('DELETE FROM ' . table_prefix.'comments WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'');
		if(!$e) $db->_die('The page comments could not be deleted.');
		$e = $db->sql_query('DELETE FROM ' . table_prefix.'page_text WHERE page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'');
		if(!$e) $db->_die('The page text entry could not be deleted.');
		$e = $db->sql_query('DELETE FROM ' . table_prefix.'pages WHERE urlname=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'');
		if(!$e) $db->_die('The page entry could not be deleted.');
		if ( $namespace == 'File' )
		{
			$e = $db->sql_query('DELETE FROM ' . table_prefix.'files WHERE page_id=\'' . $page_id . '\'');
			if(!$e) $db->_die('The file entry could not be deleted.');
		}
		$cache->purge('page_meta');
		return $lang->get('ajax_delete_success');
	}
	
	/**
 	* Deletes files associated with a File page.
 	* @param string Page ID
 	*/
	
	public static function delete_page_files($page_id)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		
		$q = $db->sql_query('SELECT file_id, filename, file_key, time_id, file_extension FROM ' . table_prefix . "files WHERE page_id = '{$db->escape($page_id)}';");
		if ( !$q )
			$db->_die();
		
		while ( $row = $db->fetchrow() )
		{
			// wipe original file
			foreach ( array(
					ENANO_ROOT . "/files/{$row['file_key']}_{$row['time_id']}{$row['file_extension']}",
					ENANO_ROOT . "/files/{$row['file_key']}{$row['file_extension']}"
				) as $orig_file )
			{
				if ( file_exists($orig_file) )
					@unlink($orig_file);
			}
			
			// wipe cached files
			if ( $dr = @opendir(ENANO_ROOT . '/cache/') )
			{
				// lol404.jpg-1217958283-200x320.jpg
				while ( $dh = @readdir($dr) )
				{
					$regexp = ':^' . preg_quote("{$row['filename']}-{$row['time_id']}-") . '[0-9]+x[0-9]+\.' . ltrim($row['file_extension'], '.') . '$:';
					if ( preg_match($regexp, $dh) )
					{
						@unlink(ENANO_ROOT . "/cache/$dh");
					}
				}
				@closedir($dr);
			}
		}
		
		$q = $db->sql_query('DELETE FROM ' . table_prefix . "files WHERE page_id = '{$db->escape($page_id)}';");
		if ( !$q )
			$db->die();
		
		return true;
	}
	
	/**
 	* Increments the deletion votes for a page by 1, and adds the current username/IP to the list of users that have voted for the page to prevent dual-voting
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @return string
 	*/
 	
	public static function delvote($page_id, $namespace)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		global $cache;
		
		if ( !$session->get_permissions('vote_delete') )
		{
			return $lang->get('etc_access_denied');
		}
		
		if ( $namespace == 'Admin' || $namespace == 'Special' || $namespace == 'System' )
		{
			return 'Special pages and system messages can\'t be voted for deletion.';
		}
		
		$pname = $paths->nslist[$namespace] . sanitize_page_id($page_id);
		
		if ( !isPage($pname) )
		{
			return 'The page does not exist.';
		}
		
		$ns = namespace_factory($page_id, $namespace);
		$cdata = $ns->get_cdata();
		
		$cv  =& $cdata['delvotes'];
		$ips =& $cdata['delvote_ips'];
		
		if ( empty($ips) )
		{
			$ips = array(
				'ip' => array(),
				'u' => array()
				);
		}
		else
		{
			$ips = @unserialize($ips);
			if ( !$ips )
			{
				$ips = array(
				'ip' => array(),
				'u' => array()
				);
			}
		}
		
		if ( in_array($session->username, $ips['u']) || in_array($_SERVER['REMOTE_ADDR'], $ips['ip']) )
		{
			return $lang->get('ajax_delvote_already_voted');
		}
		
		$ips['u'][] = $session->username;
		$ips['ip'][] = $_SERVER['REMOTE_ADDR'];
		$ips = $db->escape( serialize($ips) );
		
		$cv++;
		
		$q = 'UPDATE ' . table_prefix.'pages SET delvotes=' . $cv . ',delvote_ips=\'' . $ips . '\' WHERE urlname=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'';
		$w = $db->sql_query($q);
		if ( !$w )
			$db->_die();
		
		// all done, flush page cache to mark it up
		$cache->purge('page_meta');
		
		return $lang->get('ajax_delvote_success');
	}
	
	/**
 	* Resets the number of votes against a page to 0.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @return string
 	*/
	
	public static function resetdelvotes($page_id, $namespace)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		global $cache;
		
		if ( !$session->get_permissions('vote_reset') )
		{
			return $lang->get('etc_access_denied');
		}
		
		$page_id = $db->escape($page_id);
		$namespace = $db->escape($namespace);
		
		// pull existing info
		$q = $db->sql_query('SELECT delvotes, delvote_ips FROM ' . table_prefix . "pages WHERE urlname = '$page_id' AND namespace = '$namespace'");
		if ( !$q )
			$db->_die();
		if ( $db->numrows() < 1 )
			return $lang->get('page_err_page_not_exist');
		
		list($delvotes, $delvote_ips) = $db->fetchrow_num();
		$db->free_result();
		$delvote_ips = $db->escape($delvote_ips);
		$username = $db->escape($session->username);
		
		// log action
		$time = time();
		$q = $db->sql_query('INSERT INTO ' . table_prefix . "logs (time_id, log_type, action, edit_summary, page_text, author, author_uid, page_id, namespace) VALUES\n"
											. "  ( $time, 'page', 'votereset', '$delvotes', '$delvote_ips', '$username', $session->user_id, '$page_id', '$namespace' )");
		if ( !$q )
			$db->_die();
		
		// reset votes
		$empty_vote_record = $db->escape(serialize(array('ip'=>array(),'u'=>array())));
		$q = 'UPDATE ' . table_prefix.'pages SET delvotes=0,delvote_ips=\'' . $empty_vote_record . '\' WHERE urlname=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\'';
		$e = $db->sql_query($q);
		if ( !$e )
		{
			$db->_die('The number of delete votes was not reset.');
		}
		else
		{
			$cache->purge('page_meta');
			return $lang->get('ajax_delvote_reset_success');
		}
	}
	
	/**
 	* Gets a list of styles for a given theme name. As of Banshee, this returns JSON.
 	* @param $id the name of the directory for the theme
 	* @return string JSON string with an array containing a list of themes
 	*/
 	
	public static function getstyles()
	{
		
		if ( !preg_match('/^([a-z0-9_-]+)$/', $_GET['id']) )
			return enano_json_encode(false);
		
		$dir = './themes/' . $_GET['id'] . '/css/';
		$list = Array();
		// Open a known directory, and proceed to read its contents
		if (is_dir($dir)) {
			if ($dh = opendir($dir)) {
				while (($file = readdir($dh)) !== false) {
					if ( preg_match('#^(.*?)\.css$#is', $file) && $file != '_printable.css' ) // _printable.css should be included with every theme
					{                                                                         // it should be a copy of the original style, but
																																										// mostly black and white
																																										// Note to self: document this
						$list[] = substr($file, 0, strlen($file)-4);
					}
				}
				closedir($dh);
			}
		}
		else
		{
			return(enano_json_encode(Array('mode' => 'error', 'error' => $dir.' is not a dir')));
		}
		
		return enano_json_encode($list);
	}
	
	/**
 	* Assembles a Javascript app with category information
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @return string Javascript code
 	*/
 	
	public static function catedit($page_id, $namespace)
	{
		list($js, $html) = PageUtils::catedit_raw($page_id, $namespace);
		return $js . ' /* BEGIN CONTENT */ document.getElementById("ajaxEditContainer").innerHTML = unescape(\''.rawurlencode($html).'\');';
	}
	
	/**
 	* Does the actual HTML/javascript generation for cat editing, but returns an array
 	* @access private
 	*/
 	
	public static function catedit_raw($page_id, $namespace)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		// notes
		// span class is catCheck
		// return array(jsblob, innerHTML)
		/*
		$perms = $session->fetch_page_acl($cat_info[$i]['urlname_nons'], 'Category');
		$cat_is_protected = ( !$session->get_permissions('edit_cat') || !$perms->get_permissions('edit_cat') ||
 				( $cat_info[$i]['really_protected'] && !$perms->get_permissions('even_when_protected') ) )
		*/
		
		// two buffers: one is HTML and one is Javascript.
		$js = $html = '';
		
		// page permissions
		$page_perms = $session->fetch_page_acl($page_id, $namespace);
		
		// Pull the list of categories this page is in
		$cats_member_of = array();
		$q = $db->sql_query('SELECT category_id FROM ' . table_prefix . 'categories WHERE page_id = \'' . $db->escape($page_id) . '\' AND namespace = \'' . $db->escape($namespace) . '\';');
		if ( !$q )
			$db->_die();
		while ( $row = $db->fetchrow() )
		{
			$cats_member_of[] = $row['category_id'];
		}
		
		// Get a list of all categories on the site
		$q = $db->sql_query('SELECT * FROM ' . table_prefix . 'pages WHERE namespace = \'Category\' ORDER BY name ASC;');
		if ( !$q )
			$db->_die();
		
		$categories = array();
		while ( $row = $db->fetchrow($q) )
		{
			// bake page information
			$row = Namespace_Default::bake_cdata($row);
			// add our own info
			$row['checked'] = in_array($row['urlname_nons'], $cats_member_of);
			$row['exists'] = true;
			$row['perms'] = $session->fetch_page_acl($row['urlname_nons'], 'Category');
			$row['disabled'] = (
					// no permissions to edit categorization in this category, or
					!$row['perms']->get_permissions('edit_cat') ||
					// category is protected, and no protect override permissions
					( $row['really_protected'] && !$row['perms']->get_permissions('even_when_protected') )
				);
			// append to array
			$categories[ $row['urlname_nons'] ] = $row;
		}
		
		// fabricate information on categories that don't exist.
		foreach ( $cats_member_of as $category )
		{
			if ( isset($categories[$category]) )
				// already have it in the array, skip
				continue;
			// create page metadata
			$row = Namespace_Default::bake_cdata(array(
					'urlname' => $category,
					'namespace' => 'Category'
				));
			// we know it's in this category
			$row['checked'] = true;
			// we know it doesn't exist
			$row['exists'] = false;
			$row['perms'] = $session->fetch_page_acl($category, 'Category');
			$row['disabled'] = (
					// no permissions to edit categorization in this category (honor inheritance and everything)
					!$row['perms']->get_permissions('edit_cat')
					// not checking protection because it's defaulted to off
				);
			// append
			$categories[ $category ] = $row;
		}
		
		// spit out the form
		$html .= '<h3>' . $lang->get('catedit_title') . '</h3>';
		$html .= '<form name="mdgCatForm" action="'.makeUrlNS($namespace, $page_id, 'do=catedit').'" method="post" enctype="multipart/form-data">';
		foreach ( $categories as $category )
		{
			$html .= '<span class="catCheck"><label>';
			if ( !$category['exists'] )
				$html .= '<del>';
			$html .= '<input type="checkbox" name="categories[]" value="' . htmlspecialchars($category['urlname_nons']) . '" ';
			if ( $category['checked'] )
				$html .= 'checked="checked" ';
			if ( $category['disabled'] )
				$html .= 'disabled="disabled" ';
			$html .= ' />' . htmlspecialchars($category['name']);
			// lock icon
			if ( $category['protected'] > 0 )
				$html .= ' <img alt="' . $lang->get('catedit_msg_protected_tip') . '" width="16" height="16" src="' . cdnPath . '/images/lock16.png" />';
			if ( !$category['exists'] )
				$html .= '</del>';
			$html .= '</label></span><br />';
		}
		if ( count($categories) < 1 )
			$html .= '<p>' . $lang->get('catedit_no_categories') . '</p>';
		// submit buttons
		$save_disabled = ( count($categories) < 1 ) ? 'disabled="disabled"' : '';
		$html .= '<div style="border-top: 1px solid #CCC; padding-top: 5px; margin-top: 10px;">
					<input name="save" ' . $save_disabled . ' style="font-weight: bold;" type="submit" onclick="ajaxCatSave(); return false;" value="' . $lang->get('etc_save_changes') . '" />
					<input name="cancel" type="submit" onclick="ajaxReset(); return false;" value="' . $lang->get('etc_cancel') . '" />
				  </div>';
		
		$html .= '</form>';
		
		return array($js, $html);
	}
	
	/**
 	* Saves category information
 	* WARNING: If $which_cats is empty, all the category information for the selected page will be nuked!
 	* @param $page_id string the page ID
 	* @param $namespace string the namespace
 	* @param $which_cats array associative array of categories to put the page in
 	* @return string "GOOD" on success, error string on failure
 	*/
	
	public static function catsave($page_id, $namespace, $which_cats)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		if(!$session->get_permissions('edit_cat')) return('Insufficient privileges to change category information');
		
		$page_perms = $session->fetch_page_acl($page_id, $namespace);
		$ns = namespace_factory($page_id, $namespace);
		$page_data = $ns->get_cdata();
		if ( !$page_perms->get_permissions('edit_cat') ||
				( $page_data['really_protected'] && !$page_perms->get_permissions('even_when_protected') ) )
			return 'Insufficient privileges';
		
		// Pull the list of categories this page is in
		$cats_member_of = array();
		$q = $db->sql_query('SELECT category_id FROM ' . table_prefix . 'categories WHERE page_id = \'' . $db->escape($page_id) . '\' AND namespace = \'' . $db->escape($namespace) . '\';');
		if ( !$q )
			$db->_die();
		while ( $row = $db->fetchrow() )
		{
			$cats_member_of[] = $row['category_id'];
		}
		
		// Get a list of all categories on the site
		$q = $db->sql_query('SELECT * FROM ' . table_prefix . 'pages WHERE namespace = \'Category\' ORDER BY name ASC;');
		if ( !$q )
			$db->_die();
		
		$categories = array();
		while ( $row = $db->fetchrow($q) )
		{
			// bake page information
			$row = Namespace_Default::bake_cdata($row);
			// add our own info
			$row['checked'] = in_array($row['urlname_nons'], $cats_member_of);
			$row['exists'] = true;
			$row['perms'] = $session->fetch_page_acl($row['urlname_nons'], 'Category');
			$row['disabled'] = (
					// no permissions to edit categorization in this category, or
					!$row['perms']->get_permissions('edit_cat') ||
					// category is protected, and no protect override permissions
					( $row['really_protected'] && !$row['perms']->get_permissions('even_when_protected') )
				);
			// append to array
			$categories[ $row['urlname_nons'] ] = $row;
		}
		
		// fabricate information on categories that don't exist.
		foreach ( $cats_member_of as $category )
		{
			if ( isset($categories[$category]) )
				// already have it in the array, skip
				continue;
			// create page metadata
			$row = Namespace_Default::bake_cdata(array(
					'urlname' => $category,
					'namespace' => 'Category'
				));
			// we know it's in this category
			$row['checked'] = true;
			// we know it doesn't exist
			$row['exists'] = false;
			$row['perms'] = $session->fetch_page_acl($category, 'Category');
			$row['disabled'] = (
					// no permissions to edit categorization in this category (honor inheritance and everything)
					!$row['perms']->get_permissions('edit_cat')
					// not checking protection because it's defaulted to off, and we know we are using the defaults
					// because we made it past the check above ;)
				);
			// append
			$categories[ $category ] = $row;
		}
		
		$to_insert = $to_delete = array();
		// go through categories and mark needed changes
		foreach ( $categories as $cat_id => $category )
		{
			// allowed to change it?
			if ( $category['disabled'] )
				continue;
			
			if ( $category['checked'] && !in_array($cat_id, $which_cats) )
			{
				// delete
				$to_delete[] = $cat_id;
			}
			else if ( !$category['checked'] && in_array($cat_id, $which_cats) )
			{
				// insert
				$to_insert[] = $cat_id;
			}
			else
			{
				// no change
			}
		}
		
		// commit changes
		if ( !empty($to_insert) )
		{
			$rows = array();
			foreach ( $to_insert as $cat_id )
			{
				$rows[] = "('{$db->escape($page_id)}', '{$db->escape($namespace)}', '{$db->escape($cat_id)}')";
			}
			$q = $db->sql_query("INSERT INTO " . table_prefix . "categories(page_id, namespace, category_id) VALUES\n  "
									. implode(",\n  ", $rows) . ";");
			if ( !$q )
				$db->_die();
		}
		if ( !empty($to_delete) )
		{
			$entries = array();
			foreach ( $to_delete as $cat_id )
			{
				$entries[] = "category_id = '{$db->escape($cat_id)}'";
			}
			$q = $db->sql_query("DELETE FROM " . table_prefix . "categories WHERE page_id = '{$db->escape($page_id)}' AND namespace = '{$db->escape($namespace)}'\n"
									. "  AND ( " . implode(' OR ', $entries) . " );");
			if ( !$q )
				$db->_die();
		}
		
		
		return 'GOOD';
	}
	
	/**
 	* Sets the wiki mode level for a page.
 	* @param $page_id string the page ID
 	* @param $namespace string the namespace
 	* @param $level int 0 for off, 1 for on, 2 for use global setting
 	* @return string "GOOD" on success, error string on failure
 	*/
	
	public static function setwikimode($page_id, $namespace, $level)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $cache;
		
		if(!$session->get_permissions('set_wiki_mode')) return('Insufficient access rights');
		if ( !isset($level) || ( isset($level) && !preg_match('#^([0-2]){1}$#', (string)$level) ) )
		{
			return('Invalid mode string');
		}
		$q = $db->sql_query('UPDATE ' . table_prefix.'pages SET wiki_mode=' . $level . ' WHERE urlname=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';');
		if ( !$q )
		{
			return('Error during update query: '.$db->get_error()."\n\nSQL Backtrace:\n".$db->sql_backtrace());
		}
		
		$cache->purge('page_meta');
		return('GOOD');
	}
	
	/**
 	* Sets the access password for a page.
 	* @param $page_id string the page ID
 	* @param $namespace string the namespace
 	* @param $pass string the SHA1 hash of the password - if the password doesn't match the regex ^([0-9a-f]*){40,40}$ it will be sha1'ed
 	* @return string
 	*/
	
	public static function setpass($page_id, $namespace, $pass)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang, $cache;
		// Determine permissions
		$ns = namespace_factory($page_id, $namespace);
		$cdata = $ns->get_cdata();
		if ( $cdata['password'] != '' )
			$a = $session->get_permissions('password_reset');
		else
			$a = $session->get_permissions('password_set');
		if ( !$a )
			return $lang->get('etc_access_denied');
		if ( !isset($pass) )
			return('Password was not set on URL');
		$p = $pass;
		if ( !preg_match('#([0-9a-f]){40,40}#', $p) )
		{
			$p = sha1($p);
		}
		if ( $p == 'da39a3ee5e6b4b0d3255bfef95601890afd80709' )
			// sha1('') = da39a3ee5e6b4b0d3255bfef95601890afd80709
			$p = '';
		$e = $db->sql_query('UPDATE ' . table_prefix.'pages SET password=\'' . $p . '\' WHERE urlname=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';');
		if ( !$e )
		{
			die('PageUtils::setpass(): Error during update query: '.$db->get_error()."\n\nSQL Backtrace:\n".$db->sql_backtrace());
		}
		// Is the new password blank?
		if ( $p == '' )
		{
			return $lang->get('ajax_password_disable_success');
		}
		else
		{
			return $lang->get('ajax_password_success');
		}
	}
	
	/**
 	* Generates some preview HTML
 	* @param $text string the wikitext to use
 	* @return string
 	*/
 	
	public static function genPreview($text)
	{
		global $lang;
		$ret = '<div class="info-box">' . $lang->get('editor_preview_blurb') . '</div><div style="background-color: #F8F8F8; padding: 10px; border: 1px dashed #406080; max-height: 250px; overflow: auto; margin: 10px 0;">';
		$text = RenderMan::render(RenderMan::preprocess_text($text, false, false));
		ob_start();
		eval('?>' . $text);
		$text = ob_get_contents();
		ob_end_clean();
		$ret .= $text;
		$ret .= '</div>';
		return $ret;
	}
	
	/**
 	* Makes a scrollable box
 	* @param string $text the inner HTML
 	* @param int $height Optional - the maximum height. Defaults to 250.
 	* @return string
 	*/
 	
	public static function scrollBox($text, $height = 250)
	{
		return '<div style="background-color: #F8F8F8; padding: 10px; border: 1px dashed #406080; max-height: '.(string)intval($height).'px; overflow: auto; margin: 1em 0 1em 1em;">' . $text . '</div>';
	}
	
	/**
 	* Generates a diff summary between two page revisions.
 	* @param $page_id the page ID
 	* @param $namespace the namespace
 	* @param $id1 the time ID of the first revision
 	* @param $id2 the time ID of the second revision
 	* @return string XHTML-formatted diff
 	*/
 	
	public static function pagediff($page_id, $namespace, $id1, $id2)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		if ( !$session->get_permissions('history_view') )
			return $lang->get('etc_access_denied');
		
		if(!preg_match('#^([0-9]+)$#', (string)$id1) ||
 			!preg_match('#^([0-9]+)$#', (string)$id2  )) return 'SQL injection attempt';
		// OK we made it through security
		// Safest way to make sure we don't end up with the revisions in wrong columns is to make 2 queries
		if ( !$q1 = $db->sql_query('SELECT time_id,page_text,char_tag,author,edit_summary FROM ' . table_prefix.'logs WHERE log_id = ' . $id1 . ' AND log_type=\'page\' AND action=\'edit\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';')) return 'MySQL error: ' . $db->get_error();
		if ( !$q2 = $db->sql_query('SELECT time_id,page_text,char_tag,author,edit_summary FROM ' . table_prefix.'logs WHERE log_id = ' . $id2 . ' AND log_type=\'page\' AND action=\'edit\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';')) return 'MySQL error: ' . $db->get_error();
		$row1 = $db->fetchrow($q1);
		$db->free_result($q1);
		$row2 = $db->fetchrow($q2);
		$db->free_result($q2);
		if(sizeof($row1) < 1 || sizeof($row2) < 2)
		{
			if ( !$q1 = $db->sql_query('SELECT time_id,page_text,char_tag,author,edit_summary FROM ' . table_prefix.'logs WHERE time_id = ' . $id1 . ' AND log_type=\'page\' AND action=\'edit\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';')) return 'MySQL error: ' . $db->get_error();
			if ( !$q2 = $db->sql_query('SELECT time_id,page_text,char_tag,author,edit_summary FROM ' . table_prefix.'logs WHERE time_id = ' . $id2 . ' AND log_type=\'page\' AND action=\'edit\' AND page_id=\'' . $page_id . '\' AND namespace=\'' . $namespace . '\';')) return 'MySQL error: ' . $db->get_error();
			$row1 = $db->fetchrow($q1);
			$db->free_result($q1);
			$row2 = $db->fetchrow($q2);
			$db->free_result($q2);
			if(sizeof($row1) < 1 || sizeof($row2) < 2)
				return 'Couldn\'t find any rows that matched the query. The time ID probably doesn\'t exist in the logs table.';
		}
		$text1 = $row1['page_text'];
		$text2 = $row2['page_text'];
		$time1 = enano_date(ED_DATE | ED_TIME, $row1['time_id']);
		$time2 = enano_date(ED_DATE | ED_TIME, $row2['time_id']);
		$_ob = "
		<p>" . $lang->get('history_lbl_comparingrevisions') . " {$time1} &rarr; {$time2}</p>
		";
		// Free some memory
		unset($row1, $row2, $q1, $q2);
		
		$_ob .= RenderMan::diff($text1, $text2);
		return $_ob;
	}
	
	/**
 	* Gets ACL information about the selected page for target type X and target ID Y.
 	* @param array $parms What to select. This is an array purely for JSON compatibility. It should be an associative array with keys target_type and target_id.
 	* @return array
 	*/
 	
	public static function acl_editor($parms = Array())
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		
		if(!$session->get_permissions('edit_acl') && ( $session->user_level < USER_LEVEL_ADMIN || !defined('ACL_ALWAYS_ALLOW_ADMIN_EDIT_ACL')) )
		{
			return Array(
				'mode' => 'error',
				'error' => $lang->get('acl_err_access_denied')
				);
		}
		if ( !$session->sid_super )
		{
			return Array(
				'mode' => 'error',
				'error' => $lang->get('etc_access_denied_need_reauth')
				);
		}
		$parms['page_id'] = ( isset($parms['page_id']) ) ? $parms['page_id'] : false;
		$parms['namespace'] = ( isset($parms['namespace']) ) ? $parms['namespace'] : false;
		$page_id =& $parms['page_id'];
		$namespace =& $parms['namespace'];
		$page_where_clause      = ( empty($page_id) || empty($namespace) ) ? 'AND a.page_id IS NULL AND a.namespace IS NULL' : 'AND a.page_id=\'' . $db->escape($page_id) . '\' AND a.namespace=\'' . $db->escape($namespace) . '\'';
		$page_where_clause_lite = ( empty($page_id) || empty($namespace) ) ? 'AND page_id IS NULL AND namespace IS NULL' : 'AND page_id=\'' . $db->escape($page_id) . '\' AND namespace=\'' . $db->escape($namespace) . '\'';
		//die(print_r($page_id,true));
		$template->load_theme();
		// $perms_obj = $session->fetch_page_acl($page_id, $namespace);
		$perms_obj =& $session;
		$return = Array();
		if ( !file_exists(ENANO_ROOT . '/themes/' . $session->theme . '/acledit.tpl') )
		{
			return Array(
				'mode' => 'error',
				'error' => $lang->get('acl_err_missing_template'),
			);
		}
		$return['template'] = $template->extract_vars('acledit.tpl');
		$return['page_id'] = $page_id;
		$return['namespace'] = $namespace;
		if(isset($parms['mode']))
		{
			switch($parms['mode'])
			{
				case 'listgroups':
					$return['groups'] = Array();
					$q = $db->sql_query('SELECT group_id,group_name FROM ' . table_prefix.'groups ORDER BY group_name ASC;');
					while($row = $db->fetchrow())
					{
						$return['groups'][] = Array(
							'id' => $row['group_id'],
							'name' => $row['group_name'],
							);
					}
					$db->free_result();
					$return['page_groups'] = Array();
					$q = $db->sql_query('SELECT pg_id,pg_name FROM ' . table_prefix.'page_groups ORDER BY pg_name ASC;');
					if ( !$q )
						return Array(
							'mode' => 'error',
							'error' => $db->get_error()
							);
					while ( $row = $db->fetchrow() )
					{
						$return['page_groups'][] = Array(
								'id' => $row['pg_id'],
								'name' => $row['pg_name']
							);
					}
					break;
				case 'seltarget_id':
					if ( !is_int($parms['target_id']) )
					{
						return Array(
							'mode' => 'error',
							'error' => 'Expected parameter target_id type int'
							);
					}
					$q = $db->sql_query('SELECT target_id, target_type, page_id, namespace, rules FROM ' . table_prefix . "acl WHERE rule_id = {$parms['target_id']};");
					if ( !$q )
						return Array(
							'mode' => 'error',
							'error' => $db->get_error()
							);
					if ( $db->numrows() < 1 )
						return Array(
							'mode' => 'error',
							'error' => "No rule with ID {$parms['target_id']} found"
							);
						$parms = $db->fetchrow();
						$db->free_result();
						
						// regenerate page selection
						$parms['page_id'] = ( isset($parms['page_id']) ) ? $parms['page_id'] : false;
						$parms['namespace'] = ( isset($parms['namespace']) ) ? $parms['namespace'] : false;
						$parms['mode'] = 'seltarget_id';
						$page_id =& $parms['page_id'];
						$namespace =& $parms['namespace'];
						$page_where_clause      = ( empty($page_id) || empty($namespace) ) ? 'AND a.page_id IS NULL AND a.namespace IS NULL' : 'AND a.page_id=\'' . $db->escape($page_id) . '\' AND a.namespace=\'' . $db->escape($namespace) . '\'';
						$page_where_clause_lite = ( empty($page_id) || empty($namespace) ) ? 'AND page_id IS NULL AND namespace IS NULL' : 'AND page_id=\'' . $db->escape($page_id) . '\' AND namespace=\'' . $db->escape($namespace) . '\'';
						
						$return['page_id'] = $parms['page_id'];
						$return['namespace'] = $parms['namespace'];
						
						// From here, let the seltarget handler take over
				case 'seltarget':
					$return['mode'] = 'seltarget';
					$return['acl_types'] = $perms_obj->acl_types;
					$return['acl_deps'] = $perms_obj->acl_deps;
					$return['acl_descs'] = $perms_obj->acl_descs;
					$return['target_type'] = $parms['target_type'];
					$return['target_id'] = $parms['target_id'];
					switch($parms['target_type'])
					{
						case ACL_TYPE_USER:
							$user_col = ( $parms['mode'] == 'seltarget_id' ) ? 'user_id' : 'username';
							$q = $db->sql_query('SELECT a.rules,u.user_id,u.username FROM ' . table_prefix.'users AS u
									LEFT JOIN ' . table_prefix.'acl AS a
										ON a.target_id=u.user_id
									WHERE a.target_type='.ACL_TYPE_USER.'
										AND u.' . $user_col . ' = \'' . $db->escape($parms['target_id']) . '\'
										' . $page_where_clause . ';');
							if(!$q)
								return(Array('mode'=>'error','error'=>$db->get_error()));
							if($db->numrows() < 1)
							{
								$return['type'] = 'new';
								$q = $db->sql_query('SELECT user_id,username FROM ' . table_prefix.'users WHERE username=\'' . $db->escape($parms['target_id']) . '\';');
								if(!$q)
									return(Array('mode'=>'error','error'=>$db->get_error()));
								if($db->numrows() < 1)
									return Array('mode'=>'error','error'=>$lang->get('acl_err_user_not_found'),'debug' => $db->sql_backtrace());
								$row = $db->fetchrow();
								$return['target_name'] = $row['username'];
								$return['target_id'] = intval($row['user_id']);
								$return['current_perms'] = array();
							}
							else
							{
								$return['type'] = 'edit';
								$row = $db->fetchrow();
								$return['target_name'] = $row['username'];
								$return['target_id'] = intval($row['user_id']);
								$return['current_perms'] = $session->string_to_perm($row['rules']);
							}
							$db->free_result();
							// Eliminate types that don't apply to this namespace
							if ( $namespace && $namespace != '__PageGroup' )
							{
								foreach ( $return['current_perms'] AS $i => $perm )
								{
									if ( ( $page_id != null && $namespace != null ) && ( !in_array ( $namespace, $session->acl_scope[$i] ) && !in_array('All', $session->acl_scope[$i]) ) )
									{
										// echo "// SCOPE CONTROL: eliminating: $i\n";
										unset($return['current_perms'][$i]);
										unset($return['acl_types'][$i]);
										unset($return['acl_descs'][$i]);
										unset($return['acl_deps'][$i]);
									}
								}
							}
							break;
						case ACL_TYPE_GROUP:
							$q = $db->sql_query('SELECT a.rules,g.group_name,g.group_id FROM ' . table_prefix.'groups AS g
									LEFT JOIN ' . table_prefix.'acl AS a
										ON a.target_id=g.group_id
									WHERE a.target_type='.ACL_TYPE_GROUP.'
										AND g.group_id=\''.intval($parms['target_id']).'\'
										' . $page_where_clause . ';');
							if(!$q)
								return(Array('mode'=>'error','error'=>$db->get_error()));
							if($db->numrows() < 1)
							{
								$return['type'] = 'new';
								$q = $db->sql_query('SELECT group_id,group_name FROM ' . table_prefix.'groups WHERE group_id=\''.intval($parms['target_id']).'\';');
								if(!$q)
									return(Array('mode'=>'error','error'=>$db->get_error()));
								if($db->numrows() < 1)
									return Array('mode'=>'error','error'=>$lang->get('acl_err_bad_group_id'));
								$row = $db->fetchrow();
								$return['target_name'] = $row['group_name'];
								$return['target_id'] = intval($row['group_id']);
								$return['current_perms'] = array();
							}
							else
							{
								$return['type'] = 'edit';
								$row = $db->fetchrow();
								$return['target_name'] = $row['group_name'];
								$return['target_id'] = intval($row['group_id']);
								$return['current_perms'] = $session->string_to_perm($row['rules']);
							}
							$db->free_result();
							// Eliminate types that don't apply to this namespace
							if ( $namespace && $namespace != '__PageGroup' )
							{
								foreach ( $return['current_perms'] AS $i => $perm )
								{
									if ( ( $page_id != false && $namespace != false ) && ( !in_array ( $namespace, $session->acl_scope[$i] ) && !in_array('All', $session->acl_scope[$i]) ) )
									{
										// echo "// SCOPE CONTROL: eliminating: $i\n"; //; ".print_r($namespace,true).":".print_r($page_id,true)."\n";
										unset($return['current_perms'][$i]);
										unset($return['acl_types'][$i]);
										unset($return['acl_descs'][$i]);
										unset($return['acl_deps'][$i]);
									}
								}
							}
							//return Array('mode'=>'debug','text'=>print_r($return, true));
							break;
						default:
							return Array('mode'=>'error','error','Invalid ACL type ID');
							break;
					}
					return $return;
					break;
				case 'save_new':
				case 'save_edit':
					if ( defined('ENANO_DEMO_MODE') )
					{
						return Array('mode'=>'error','error'=>$lang->get('acl_err_demo'));
					}
					$q = $db->sql_query('DELETE FROM ' . table_prefix.'acl WHERE target_type='.intval($parms['target_type']).' AND target_id='.intval($parms['target_id']).'
						' . $page_where_clause_lite . ';');
					if(!$q)
						return Array('mode'=>'error','error'=>$db->get_error());
					if ( sizeof ( $parms['perms'] ) < 1 )
					{
						// As of 1.1.x, this returns success because the rule length is zero if the user selected "inherit" in all columns
						return Array(
							'mode' => 'success',
							'target_type' => $parms['target_type'],
							'target_id' => $parms['target_id'],
							'target_name' => $parms['target_name'],
							'page_id' => $page_id,
							'namespace' => $namespace,
						);
					}
					$rules = $session->perm_to_string($parms['perms']);
					$q = ($page_id && $namespace) ? 'INSERT INTO ' . table_prefix.'acl ( target_type, target_id, page_id, namespace, rules )
 																						VALUES( '.intval($parms['target_type']).', '.intval($parms['target_id']).', \'' . $db->escape($page_id) . '\', \'' . $db->escape($namespace) . '\', \'' . $db->escape($rules) . '\' )' :
																					'INSERT INTO ' . table_prefix.'acl ( target_type, target_id, rules )
 																						VALUES( '.intval($parms['target_type']).', '.intval($parms['target_id']).', \'' . $db->escape($rules) . '\' )';
					if(!$db->sql_query($q)) return Array('mode'=>'error','error'=>$db->get_error());
					return Array(
							'mode' => 'success',
							'target_type' => $parms['target_type'],
							'target_id' => $parms['target_id'],
							'target_name' => $parms['target_name'],
							'page_id' => $page_id,
							'namespace' => $namespace,
						);
					break;
				case 'delete':
					if ( defined('ENANO_DEMO_MODE') )
					{
						return Array('mode'=>'error','error'=>$lang->get('acl_err_demo'));
					}
					$sql = 'DELETE FROM ' . table_prefix.'acl WHERE target_type='.intval($parms['target_type']).' AND target_id='.intval($parms['target_id']).'
						' . $page_where_clause_lite . ';';
					$q = $db->sql_query($sql);
					if(!$q)
						return Array('mode'=>'error','error'=>$db->get_error());
					return Array(
							'mode' => 'delete',
							'target_type' => $parms['target_type'],
							'target_id' => $parms['target_id'],
							'target_name' => $parms['target_name'],
							'page_id' => $page_id,
							'namespace' => $namespace,
						);
					break;
				case 'list_existing':
					
					$return = array(
							'mode'  => 'list_existing',
							'key'   => acl_list_draw_key(),
							'rules' => array()
						);
					
					$acl_columns = 'a.' . implode(', a.', $db->columns_in(table_prefix . 'acl'));
					$users_columns = 'u.' . implode(', u.', $db->columns_in(table_prefix . 'users'));
					$groups_columns = 'g.' . implode(', g.', $db->columns_in(table_prefix . 'groups'));
					$pg_columns = 'p.' . implode(', p.', array('pg_id', 'pg_type', 'pg_name', 'pg_target'));
					
					$q = $db->sql_query("SELECT a.rule_id, u.username, g.group_name, a.target_type, a.target_id, a.page_id, a.namespace, a.rules, p.pg_name\n"
									. "  FROM " . table_prefix . "acl AS a\n"
									. "  LEFT JOIN " . table_prefix . "users AS u\n"
									. "    ON ( (a.target_type = " . ACL_TYPE_USER . " AND a.target_id = u.user_id) OR (u.user_id IS NULL) )\n"
									. "  LEFT JOIN " . table_prefix . "groups AS g\n"
									. "    ON ( (a.target_type = " . ACL_TYPE_GROUP . " AND a.target_id = g.group_id) OR (g.group_id IS NULL) )\n"
									. "  LEFT JOIN " . table_prefix . "page_groups as p\n"
									. "    ON ( (a.namespace = '__PageGroup' AND a.page_id = CAST(p.pg_id AS CHAR)) OR (p.pg_id IS NULL) )\n"
									. "  WHERE ( a.target_type = " . ACL_TYPE_USER . " OR a.target_type = " . ACL_TYPE_GROUP . " )\n"
									. "  GROUP BY a.rule_id, $acl_columns, $users_columns, $groups_columns, $pg_columns\n"
									. "  ORDER BY a.target_type ASC, a.rule_id ASC;"
								);
					
					if ( !$q )
						$db->_die();
					
					while ( $row = $db->fetchrow($q) )
					{
						if ( $row['target_type'] == ACL_TYPE_USER && empty($row['username']) )
						{
							// This is only done if we have an ACL affecting a user that doesn't exist.
							// Nice little bit of maintenance to have.
							if ( !$db->sql_query("DELETE FROM " . table_prefix . "acl WHERE rule_id = {$row['rule_id']};") )
								$db->_die();
							continue;
						}
						$score = get_acl_rule_score($row['rules']);
						$deep_limit = ACL_SCALE_MINIMAL_SHADE;
						// Determine background color of cell by score
						if ( $score > 5 )
						{
							// high score, show in green
							$color = 2.5 * $score;
							if ( $color > 255 )
								$color = 255;
							$color = round($color);
							// blend with the colordepth limit
							$color = $deep_limit + ( ( 0xFF - $deep_limit ) - ( ( $color / 0xFF ) * ( 0xFF - $deep_limit ) ) );
							$color = dechex($color);
							$color = "{$color}ff{$color}";
						}
						else if ( $score < -5 )
						{
							// low score, show in red
							$color = 0 - $score;
							$color = 2.5 * $color;
							if ( $color > 255 )
								$color = 255;
							$color = round($color);
							// blend with the colordepth limit
							$color = $deep_limit + ( ( 0xFF - $deep_limit ) - ( ( $color / 0xFF ) * ( 0xFF - $deep_limit ) ) );
							$color = dechex($color);
							$color = "ff{$color}{$color}";
						}
						else
						{
							$color = 'efefef';
						}
						
						// Rate rule textually based on its score
						if ( $score >= 70 )
							$desc = $lang->get('acl_msg_scale_allow');
						else if ( $score >= 50 )
							$desc = $lang->get('acl_msg_scale_mostly_allow');
						else if ( $score >= 25 )
							$desc = $lang->get('acl_msg_scale_some_allow');
						else if ( $score >= -25 )
							$desc = $lang->get('acl_msg_scale_mixed');
						else if ( $score <= -70 )
							$desc = $lang->get('acl_msg_scale_deny');
						else if ( $score <= -50 )
							$desc = $lang->get('acl_msg_scale_mostly_deny');
						else if ( $score <= -25 )
							$desc = $lang->get('acl_msg_scale_some_deny');
						
						// group and user target info
						$info = '';
						if ( $row['target_type'] == ACL_TYPE_USER )
							$info = $lang->get('acl_msg_list_user', array( 'username' => $row['username'] )); // "(User: {$row['username']})";
						else if ( $row['target_type'] == ACL_TYPE_GROUP )
							$info = $lang->get('acl_msg_list_group', array( 'group' => $row['group_name'] ));
						
						// affected pages info
						if ( $row['page_id'] && $row['namespace'] && $row['namespace'] != '__PageGroup' )
							$info .= $lang->get('acl_msg_list_on_page', array( 'page_name' => "{$row['namespace']}:{$row['page_id']}" ));
						else if ( $row['page_id'] && $row['namespace'] && $row['namespace'] == '__PageGroup' )
							$info .= $lang->get('acl_msg_list_on_page_group', array( 'page_group' => $row['pg_name'] ));
						else
							$info .= $lang->get('acl_msg_list_entire_site');
							
						$score_string = $lang->get('acl_msg_list_score', array
							(
								'score' => $score,
								'desc'  => $desc,
								'info'  => $info
								));
						$return['rules'][] = array(
							'score_string' => $score_string,
							'rule_id'      => $row['rule_id'],
							'color'        => $color
							);
					}
					
					break;
				case 'list_presets':
					$presets = array();
					$q = $db->sql_query('SELECT page_id AS preset_name, rule_id, rules FROM ' . table_prefix . "acl WHERE target_type = " . ACL_TYPE_PRESET . ";");
					if ( !$q )
						$db->die_json();
					
					while ( $row = $db->fetchrow() )
					{
						$row['rules'] = $session->string_to_perm($row['rules']);
						$presets[] = $row;
					}
					
					return array(
						'mode' => 'list_existing',
						'presets' => $presets
					);
					break;
				case 'save_preset':
					if ( empty($parms['preset_name']) )
					{
						return array(
							'mode' => 'error',
							'error' => $lang->get('acl_err_preset_name_empty')
						);
					}
					$preset_name = $db->escape($parms['preset_name']);
					$q = $db->sql_query('DELETE FROM ' . table_prefix . "acl WHERE target_type = " . ACL_TYPE_PRESET . " AND page_id = '$preset_name';");
					if ( !$q )
						$db->die_json();
					
					$perms = $session->perm_to_string($parms['perms']);
					if ( !$perms )
					{
						return array(
							'mode' => 'error',
							'error' => $lang->get('acl_err_preset_is_blank')
						);
					}
					
					$perms = $db->escape($perms);
					$q = $db->sql_query('INSERT INTO ' . table_prefix . "acl(page_id, target_type, rules) VALUES\n"
														. "  ( '$preset_name', " . ACL_TYPE_PRESET . ", '$perms' );");
					if ( !$q )
						$db->die_json();
					
					return array(
							'mode' => 'success'
						);
					break;
				case 'trace':
					list($targetpid, $targetns) = RenderMan::strToPageID($parms['page']);
					try
					{
						$perms = $session->fetch_page_acl_user($parms['user'], $targetpid, $targetns);
						$perm_table = array(
								AUTH_ALLOW => 'acl_lbl_field_allow',
								AUTH_WIKIMODE => 'acl_lbl_field_wikimode',
								AUTH_DISALLOW => 'acl_lbl_field_disallow',
								AUTH_DENY => 'acl_lbl_field_deny'
							);
						
						$return = array(
							'mode' => 'trace',
							'perms' => array()
						);
						
						foreach ( $perms->perm_resolve_table as $perm_type => $lookup_data )
						{
							if ( !$session->check_acl_scope($perm_type, $targetns) )
								continue;
							
							$src_l10n = $lang->get($session->acl_inherit_lang_table[$lookup_data['src']], $lookup_data);
							$divclass = preg_replace('/^acl_inherit_/', '', $session->acl_inherit_lang_table[$lookup_data['src']]);
							$perm_string = $lang->get($perm_table[$perms->perms[$perm_type]]);
							$perm_name = $lang->get($session->acl_descs[$perm_type]);
							
							$return['perms'][$perm_type] = array(
									'divclass' => "acl_inherit acl_$divclass",
									'perm_type' => $perm_type,
									'perm_name' => $perm_name,
									'perm_value' => $perm_string,
									'perm_src' => $src_l10n,
									'rule_id' => intval($lookup_data['rule_id']),
									'bad_deps' => $perms->acl_check_deps($perm_type, true)
								);
						}
						
						// group rules if possible
						$return['groups'] = array();
						foreach ( $return['perms'] as $rule )
						{
							if ( !isset($return['groups'][$rule['rule_id']]) )
							{
								$return['groups'][$rule['rule_id']] = array();
							}
							$return['groups'][$rule['rule_id']][] = $rule['perm_type'];
						}
					}
					catch ( Exception $e )
					{
						$return = array(
								'mode' => 'error',
								'error' => $e->getMessage()
							);
					}
					
					break;
				default:
					return Array('mode'=>'error','error'=>'Hacking attempt');
					break;
			}
		}
		return $return;
	}
	
	/**
 	* Same as PageUtils::acl_editor(), but the parms are a JSON string instead of an array. This also returns a JSON string.
 	* @param string $parms Same as PageUtils::acl_editor/$parms, but should be a valid JSON string.
 	* @return string
 	*/
 	
	public static function acl_json($parms = '{ }')
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		try
		{
			$parms = enano_json_decode($parms);
		}
		catch ( Zend_Json_Exception $e )
		{
			$parms = array();
		}
		$ret = PageUtils::acl_editor($parms);
		$ret = enano_json_encode($ret);
		return $ret;
	}
	
	/**
 	* A non-Javascript frontend for the ACL API.
 	* @param array The request data, if any, this should be in the format required by PageUtils::acl_editor()
 	*/
 	
	public static function aclmanager($parms)
	{
		global $db, $session, $paths, $template, $plugins; // Common objects
		global $lang;
		ob_start();
		// Convenience
		$formstart = '<form 
										action="' . makeUrl($paths->page, 'do=aclmanager', true) . '"
										method="post" enctype="multipart/form-data"
										onsubmit="if(!submitAuthorized) return false;"
										>';
		$formend   = '</form>';
		$parms    = PageUtils::acl_preprocess($parms);
		$response = PageUtils::acl_editor($parms);
		$response = PageUtils::acl_postprocess($response);
		
		//die('<pre>' . htmlspecialchars(print_r($response, true)) . '</pre>');
		
		switch($response['mode'])
		{
			case 'debug':
				echo '<pre>' . htmlspecialchars($response['text']) . '</pre>';
				break;
			case 'stage1':
				echo '<h3>' . $lang->get('acl_lbl_welcome_title') . '</h3>
							<p>' . $lang->get('acl_lbl_welcome_body') . '</p>';
				echo $formstart;
				echo '<p><label><input type="radio" name="data[target_type]" value="' . ACL_TYPE_GROUP . '" checked="checked" /> ' . $lang->get('acl_radio_usergroup') . '</label></p>
							<p><select name="data[target_id_grp]">';
				foreach ( $response['groups'] as $group )
				{
					echo '<option value="' . $group['id'] . '">' . $group['name'] . '</option>';
				}
				
				// page group selector
				$groupsel = '';
				if ( count($response['page_groups']) > 0 )
				{
					$groupsel = '<p><label><input type="radio" name="data[scope]" value="page_group" /> ' . $lang->get('acl_radio_scope_pagegroup') . '</label></p>
 											<p><select name="data[pg_id]">';
					foreach ( $response['page_groups'] as $grp )
					{
						$groupsel .= '<option value="' . $grp['id'] . '">' . htmlspecialchars($grp['name']) . '</option>';
					}
					$groupsel .= '</select></p>';
				}
				
				echo '</select></p>
							<p><label><input type="radio" name="data[target_type]" value="' . ACL_TYPE_USER . '" /> ' . $lang->get('acl_radio_user') . '</label></p>
							<p>' . $template->username_field('data[target_id_user]') . '</p>
							<p>' . $lang->get('acl_lbl_scope') . '</p>
							<p><label><input name="data[scope]" value="only_this" type="radio" checked="checked" /> ' . $lang->get('acl_radio_scope_thispage') . '</p>
							' . $groupsel . '
							<p><label><input name="data[scope]" value="entire_site" type="radio" /> ' . $lang->get('acl_radio_scope_wholesite') . '</p>
							<div style="margin: 0 auto 0 0; text-align: right;">
								<input name="data[mode]" value="seltarget" type="hidden" />
								<input type="hidden" name="data[page_id]" value="' . $paths->page_id . '" />
								<input type="hidden" name="data[namespace]" value="' . $paths->namespace . '" />
								<input type="submit" value="' . htmlspecialchars($lang->get('etc_wizard_next')) . '" />
							</div>';
				echo $formend;
				break;
			case 'success':
				echo '<div class="info-box">
								<b>' . $lang->get('acl_lbl_save_success_title') . '</b><br />
								' . $lang->get('acl_lbl_save_success_body', array( 'target_name' => $response['target_name'] )) . '<br />
								' . $formstart . '
								<input type="hidden" name="data[mode]" value="seltarget" />
								<input type="hidden" name="data[target_type]" value="' . $response['target_type'] . '" />
								<input type="hidden" name="data[target_id_user]" value="' . ( ( intval($response['target_type']) == ACL_TYPE_USER ) ? $response['target_name'] : $response['target_id'] ) .'" />
								<input type="hidden" name="data[target_id_grp]"  value="' . ( ( intval($response['target_type']) == ACL_TYPE_USER ) ? $response['target_name'] : $response['target_id'] ) .'" />
								<input type="hidden" name="data[scope]" value="' . ( ( $response['page_id'] ) ? 'only_this' : 'entire_site' ) . '" />
								<input type="hidden" name="data[page_id]" value="' . ( ( $response['page_id'] ) ? $response['page_id'] : 'false' ) . '" />
								<input type="hidden" name="data[namespace]" value="' . ( ( $response['namespace'] ) ? $response['namespace'] : 'false' ) . '" />
								<input type="submit" value="' . $lang->get('acl_btn_returnto_editor') . '" /> <input type="submit" name="data[act_go_stage1]" value="' . $lang->get('acl_btn_returnto_userscope') . '" />
								' . $formend . '
							</div>';
				break;
			case 'delete':
				echo '<div class="info-box">
								<b>' . $lang->get('acl_lbl_delete_success_title') . '</b><br />
								' . $lang->get('acl_lbl_delete_success_body', array('target_name' => $response['target_name'])) . '<br />
								' . $formstart . '
								<input type="hidden" name="data[mode]" value="seltarget" />
								<input type="hidden" name="data[target_type]" value="' . $response['target_type'] . '" />
								<input type="hidden" name="data[target_id_user]" value="' . ( ( intval($response['target_type']) == ACL_TYPE_USER ) ? $response['target_name'] : $response['target_id'] ) .'" />
								<input type="hidden" name="data[target_id_grp]"  value="' . ( ( intval($response['target_type']) == ACL_TYPE_USER ) ? $response['target_name'] : $response['target_id'] ) .'" />
								<input type="hidden" name="data[scope]" value="' . ( ( $response['page_id'] ) ? 'only_this' : 'entire_site' ) . '" />
								<input type="hidden" name="data[page_id]" value="' . ( ( $response['page_id'] ) ? $response['page_id'] : 'false' ) . '" />
								<input type="hidden" name="data[namespace]" value="' . ( ( $response['namespace'] ) ? $response['namespace'] : 'false' ) . '" />
								<input type="submit" value="' . $lang->get('acl_btn_returnto_editor') . '" /> <input type="submit" name="data[act_go_stage1]" value="' . $lang->get('acl_btn_returnto_userscope') . '" />
								' . $formend . '
							</div>';
				break;
			case 'seltarget':
				if ( $response['type'] == 'edit' )
				{
					echo '<h3>' . $lang->get('acl_lbl_editwin_title_edit') . '</h3>';
				}
				else
				{
					echo '<h3>' . $lang->get('acl_lbl_editwin_title_create') . '</h3>';
				}
				$type  = ( $response['target_type'] == ACL_TYPE_GROUP ) ? $lang->get('acl_target_type_group') : $lang->get('acl_target_type_user');
				$scope = ( $response['page_id'] ) ? ( $response['namespace'] == '__PageGroup' ? $lang->get('acl_scope_type_pagegroup') : $lang->get('acl_scope_type_thispage') ) : $lang->get('acl_scope_type_wholesite');
				$subs = array(
						'target_type' => $type,
						'target' => $response['target_name'],
						'scope_type' => $scope
					);
				echo $lang->get('acl_lbl_editwin_body', $subs);
				echo $formstart;
				$parser = $template->makeParserText( $response['template']['acl_field_begin'] );
				echo $parser->run();
				$parser = $template->makeParserText( $response['template']['acl_field_item'] );
				$cls = 'row2';
				foreach ( $response['acl_types'] as $acl_type => $value )
				{
					$vars = Array(
							'FIELD_INHERIT_CHECKED' => '',
							'FIELD_DENY_CHECKED' => '',
							'FIELD_DISALLOW_CHECKED' => '',
							'FIELD_WIKIMODE_CHECKED' => '',
							'FIELD_ALLOW_CHECKED' => '',
						);
					$cls = ( $cls == 'row1' ) ? 'row2' : 'row1';
					$vars['ROW_CLASS'] = $cls;
					
					switch ( $response['current_perms'][$acl_type] )
					{
						case 'i':
						default:
							$vars['FIELD_INHERIT_CHECKED'] = 'checked="checked"';
							break;
						case AUTH_ALLOW:
							$vars['FIELD_ALLOW_CHECKED'] = 'checked="checked"';
							break;
						case AUTH_WIKIMODE:
							$vars['FIELD_WIKIMODE_CHECKED'] = 'checked="checked"';
							break;
						case AUTH_DISALLOW:
							$vars['FIELD_DISALLOW_CHECKED'] = 'checked="checked"';
							break;
 						case AUTH_DENY:
							$vars['FIELD_DENY_CHECKED'] = 'checked="checked"';
							break;
					}
					$vars['FIELD_NAME'] = 'data[perms][' . $acl_type . ']';
					if ( preg_match('/^([a-z0-9_]+)$/', $response['acl_descs'][$acl_type]) )
					{
						$vars['FIELD_DESC'] = $lang->get($response['acl_descs'][$acl_type]);
					}
					else
					{
						$vars['FIELD_DESC'] = $response['acl_descs'][$acl_type];
					}
					$parser->assign_vars($vars);
					echo $parser->run();
				}
				$parser = $template->makeParserText( $response['template']['acl_field_end'] );
				echo $parser->run();
				echo '<div style="margin: 10px auto 0 0; text-align: right;">
								<input name="data[mode]" value="save_' . $response['type'] . '" type="hidden" />
								<input type="hidden" name="data[page_id]" value="'   . (( $response['page_id']   ) ? $response['page_id']   : 'false') . '" />
								<input type="hidden" name="data[namespace]" value="' . (( $response['namespace'] ) ? $response['namespace'] : 'false') . '" />
								<input type="hidden" name="data[target_type]" value="' . $response['target_type'] . '" />
								<input type="hidden" name="data[target_id]" value="' . $response['target_id'] . '" />
								<input type="hidden" name="data[target_name]" value="' . $response['target_name'] . '" />
								' . ( ( $response['type'] == 'edit' ) ? '<input type="submit" value="' . $lang->get('etc_save_changes') . '" />&nbsp;&nbsp;<input type="submit" name="data[act_delete_rule]" value="' . $lang->get('acl_btn_deleterule') . '" style="color: #AA0000;" onclick="return confirm(\'' . addslashes($lang->get('acl_msg_deleterule_confirm')) . '\');" />' : '<input type="submit" value="' . $lang->get('acl_btn_createrule') . '" />' ) . '
							</div>';
				echo $formend;
				break;
			case 'error':
				ob_end_clean();
				die_friendly('Error occurred', '<p>Error returned by permissions API:</p><pre>' . htmlspecialchars($response['error']) . '</pre>');
				break;
		}
		$ret = ob_get_contents();
		ob_end_clean();
		echo
			$template->getHeader() .
			$ret .
			$template->getFooter();
	}
	
	/**
 	* Preprocessor to turn the form-submitted data from the ACL editor into something the backend can handle
 	* @param array The posted data
 	* @return array
 	* @access private
 	*/
 	
	public static function acl_preprocess($parms)
	{
		if ( !isset($parms['mode']) )
			// Nothing to do
			return $parms;
		switch ( $parms['mode'] )
		{
			case 'seltarget':
				
				// Who's affected?
				$parms['target_type'] = intval( $parms['target_type'] );
				$parms['target_id'] = ( $parms['target_type'] == ACL_TYPE_GROUP ) ? $parms['target_id_grp'] : $parms['target_id_user'];
				
			case 'save_edit':
			case 'save_new':
				if ( isset($parms['act_delete_rule']) )
				{
					$parms['mode'] = 'delete';
				}
				
				// Scope (just this page or entire site?)
				if ( $parms['scope'] == 'entire_site' || ( $parms['page_id'] == 'false' && $parms['namespace'] == 'false' ) )
				{
					$parms['page_id']   = false;
					$parms['namespace'] = false;
				}
				else if ( $parms['scope'] == 'page_group' )
				{
					$parms['page_id'] = $parms['pg_id'];
					$parms['namespace'] = '__PageGroup';
				}
				
				break;
		}
		
		if ( isset($parms['act_go_stage1']) )
		{
			$parms = array(
					'mode' => 'listgroups'
				);
		}
		
		return $parms;
	}
	
	public static function acl_postprocess($response)
	{
		if(!isset($response['mode']))
		{
			if ( isset($response['groups']) )
				$response['mode'] = 'stage1';
			else
				$response = Array(
						'mode' => 'error',
						'error' => 'Invalid action passed by API backend.',
					);
		}
		return $response;
	}
 	
}

/**
 * Generates a graphical key showing how the ACL rule list works.
 * @return string
 */

function acl_list_draw_key()
{
	$out  = '<div style="width: 460px; margin: 0 auto; text-align: center; margin-bottom: 10px;">';
	$out .= '<div style="float: left;">&larr; Deny</div>';
	$out .= '<div style="float: right;">Allow &rarr;</div>';
	$out .= 'Neutral';
	$out .= '<div style="clear: both;"></div>';
	// 11 boxes on each side of the center
	$inc = ceil ( ( 0xFF - ACL_SCALE_MINIMAL_SHADE ) / 11 );
	for ( $i = ACL_SCALE_MINIMAL_SHADE; $i <= 0xFF; $i+= $inc )
	{
		$octet = dechex($i);
		$color = "ff$octet$octet";
		$out .= '<div style="background-color: #' . $color . '; float: left; width: 20px;">&nbsp;</div>';
	}
	$out .= '<div style="background-color: #efefef; float: left; width: 20px;">&nbsp;</div>';
	for ( $i = 0xFF; $i >= ACL_SCALE_MINIMAL_SHADE; $i-= $inc )
	{
		$octet = dechex($i);
		$color = "{$octet}ff{$octet}";
		$out .= '<div style="background-color: #' . $color . '; float: left; width: 20px;">&nbsp;</div>';
	}
	$out .= '<div style="clear: both;"></div>';
	$out .= '<div style="float: left;">-100</div>';
	$out .= '<div style="float: right;">+100</div>';
	$out .= '0';
	$out .= '</div>';
	return $out;
}

/**
 * Gets the numerical score for the serialized form of an ACL rule
 */

function get_acl_rule_score($perms)
{
	global $db, $session, $paths, $template, $plugins; // Common objects
	if ( is_string($perms) )
		$perms = $session->string_to_perm($perms);
	else if ( !is_array($perms) )
		return false;
	$score = 0;
	foreach ( $perms as $item )
	{
		switch ( $item )
		{
			case AUTH_ALLOW :
				$inc = 2;
				break;
			case AUTH_WIKIMODE:
				$inc = 1;
				break;
			case AUTH_DISALLOW:
				$inc = -1;
				break;
			case AUTH_DENY:
				$inc = -2;
				break;
			default:
				$inc = 0;
				break;
		}
		$score += $inc;
	}
	// this is different from the beta; calculate highest score and
	// get percentage to be fairer to smaller/less broad rules
	$divisor = count($perms) * 2;
	if ( $divisor == 0 )
	{
		return 0;
	}
	$score = 100 * ( $score / $divisor );
	return round($score);
}

?>
